WIP - add extractor, generate snippet_data

node_modules/jsx-ast-utils/lib/values/JSXElement.js

@@ -0,0 +1,14 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromJSXElement;
+/**
+ * Extractor function for a JSXElement type value node.
+ *
+ * Returns self-closing element with correct name.
+ */
+function extractValueFromJSXElement(value) {
+  return "<" + value.openingElement.name.name + " />";
+}

node_modules/jsx-ast-utils/lib/values/Literal.js

@@ -0,0 +1,27 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromLiteral;
+/**
+ * Extractor function for a Literal type value node.
+ *
+ * @param - value - AST Value object with type `Literal`
+ * @returns { String|Boolean } - The extracted value converted to correct type.
+ */
+function extractValueFromLiteral(value) {
+  var extractedValue = value.value;
+
+
+  var normalizedStringValue = typeof extractedValue === 'string' && extractedValue.toLowerCase();
+  if (normalizedStringValue === 'true') {
+    return true;
+  }
+
+  if (normalizedStringValue === 'false') {
+    return false;
+  }
+
+  return extractedValue;
+}

node_modules/jsx-ast-utils/lib/values/expressions/ArrayExpression.js

@@ -0,0 +1,19 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromArrayExpression;
+/**
+ * Extractor function for an ArrayExpression type value node.
+ * An array expression is an expression with [] syntax.
+ *
+ * @returns - An array of the extracted elements.
+ */
+function extractValueFromArrayExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  return value.elements.map(function (element) {
+    return getValue(element);
+  });
+}

node_modules/jsx-ast-utils/lib/values/expressions/BinaryExpression.js

@@ -0,0 +1,78 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromBinaryExpression;
+/**
+ * Extractor function for a BinaryExpression type value node.
+ * A binary expression has a left and right side separated by an operator
+ * such as `a + b`.
+ *
+ * @param - value - AST Value object with type `BinaryExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromBinaryExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  var operator = value.operator,
+      left = value.left,
+      right = value.right;
+
+  var leftVal = getValue(left);
+  var rightVal = getValue(right);
+
+  switch (operator) {
+    case '==':
+      return leftVal == rightVal; // eslint-disable-line
+    case '!=':
+      return leftVal != rightVal; // eslint-disable-line
+    case '===':
+      return leftVal === rightVal;
+    case '!==':
+      return leftVal !== rightVal;
+    case '<':
+      return leftVal < rightVal;
+    case '<=':
+      return leftVal <= rightVal;
+    case '>':
+      return leftVal > rightVal;
+    case '>=':
+      return leftVal >= rightVal;
+    case '<<':
+      return leftVal << rightVal; // eslint-disable-line no-bitwise
+    case '>>':
+      return leftVal >> rightVal; // eslint-disable-line no-bitwise
+    case '>>>':
+      return leftVal >>> rightVal; // eslint-disable-line no-bitwise
+    case '+':
+      return leftVal + rightVal;
+    case '-':
+      return leftVal - rightVal;
+    case '*':
+      return leftVal * rightVal;
+    case '/':
+      return leftVal / rightVal;
+    case '%':
+      return leftVal % rightVal;
+    case '|':
+      return leftVal | rightVal; // eslint-disable-line no-bitwise
+    case '^':
+      return leftVal ^ rightVal; // eslint-disable-line no-bitwise
+    case '&':
+      return leftVal & rightVal; // eslint-disable-line no-bitwise
+    case 'in':
+      try {
+        return leftVal in rightVal;
+      } catch (err) {
+        return false;
+      }
+    case 'instanceof':
+      if (typeof rightVal !== 'function') {
+        return false;
+      }
+      return leftVal instanceof rightVal;
+    default:
+      return undefined;
+  }
+}

node_modules/jsx-ast-utils/lib/values/expressions/BindExpression.js

@@ -0,0 +1,30 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromBindExpression;
+/**
+ * Extractor function for a BindExpression type value node.
+ * A bind expression looks like `::this.foo`
+ * This will return `this.foo.bind(this)` as the value to indicate its existence,
+ * since we can not execute the function this.foo.bind(this) in a static environment.
+ *
+ * @param - value - AST Value object with type `BindExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromBindExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  var callee = getValue(value.callee);
+
+  // If value.object === null, the callee must be a MemberExpression.
+  // https://github.com/babel/babylon/blob/master/ast/spec.md#bindexpression
+  var object = value.object === null ? getValue(value.callee.object) : getValue(value.object);
+
+  if (value.object && value.object.property) {
+    return object + '.' + callee + '.bind(' + object + ')';
+  }
+
+  return callee + '.bind(' + object + ')';
+}

node_modules/jsx-ast-utils/lib/values/expressions/CallExpression.js

@@ -0,0 +1,20 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromCallExpression;
+/**
+ * Extractor function for a CallExpression type value node.
+ * A call expression looks like `bar()`
+ * This will return `bar` as the value to indicate its existence,
+ * since we can not execute the function bar in a static environment.
+ *
+ * @param - value - AST Value object with type `CallExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromCallExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  return getValue(value.callee);
+}

node_modules/jsx-ast-utils/lib/values/expressions/ConditionalExpression.js

@@ -0,0 +1,22 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromConditionalExpression;
+/**
+ * Extractor function for a ConditionalExpression type value node.
+ *
+ * @param - value - AST Value object with type `ConditionalExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromConditionalExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  var test = value.test,
+      alternate = value.alternate,
+      consequent = value.consequent;
+
+
+  return getValue(test) ? getValue(consequent) : getValue(alternate);
+}

node_modules/jsx-ast-utils/lib/values/expressions/FunctionExpression.js

@@ -0,0 +1,19 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromFunctionExpression;
+/**
+ * Extractor function for a FunctionExpression type value node.
+ * Statically, we can't execute the given function, so just return a function
+ * to indicate that the value is present.
+ *
+ * @param - value - AST Value object with type `FunctionExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromFunctionExpression(value) {
+  return function () {
+    return value;
+  };
+}

node_modules/jsx-ast-utils/lib/values/expressions/Identifier.js

@@ -0,0 +1,35 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromIdentifier;
+var JS_RESERVED = {
+  Array: Array,
+  Date: Date,
+  Infinity: Infinity,
+  Math: Math,
+  Number: Number,
+  Object: Object,
+  String: String,
+  undefined: undefined
+};
+
+/**
+ * Extractor function for a Identifier type value node.
+ * An Identifier is usually a reference to a variable.
+ * Just return variable name to determine its existence.
+ *
+ * @param - value - AST Value object with type `Identifier`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromIdentifier(value) {
+  var name = value.name;
+
+
+  if (Object.hasOwnProperty.call(JS_RESERVED, name)) {
+    return JS_RESERVED[name];
+  }
+
+  return name;
+}

node_modules/jsx-ast-utils/lib/values/expressions/LogicalExpression.js

@@ -0,0 +1,26 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromLogicalExpression;
+/**
+ * Extractor function for a LogicalExpression type value node.
+ * A logical expression is `a && b` or `a || b`, so we evaluate both sides
+ * and return the extracted value of the expression.
+ *
+ * @param - value - AST Value object with type `LogicalExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromLogicalExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  var operator = value.operator,
+      left = value.left,
+      right = value.right;
+
+  var leftVal = getValue(left);
+  var rightVal = getValue(right);
+
+  return operator === '&&' ? leftVal && rightVal : leftVal || rightVal;
+}

node_modules/jsx-ast-utils/lib/values/expressions/MemberExpression.js

@@ -0,0 +1,19 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromMemberExpression;
+/**
+ * Extractor function for a MemberExpression type value node.
+ * A member expression is accessing a property on an object `obj.property`.
+ *
+ * @param - value - AST Value object with type `MemberExpression`
+ * @returns - The extracted value converted to correct type
+ *  and maintaing `obj.property` convention.
+ */
+function extractValueFromMemberExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  return getValue(value.object) + '.' + getValue(value.property);
+}

node_modules/jsx-ast-utils/lib/values/expressions/NewExpression.js

@@ -0,0 +1,15 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromNewExpression;
+/**
+ * Extractor function for a NewExpression type value node.
+ * A new expression instantiates an object with `new` keyword.
+ *
+ * @returns - an empty object.
+ */
+function extractValueFromNewExpression() {
+  return new Object(); // eslint-disable-line
+}

node_modules/jsx-ast-utils/lib/values/expressions/ObjectExpression.js

@@ -0,0 +1,35 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromObjectExpression;
+
+var _object = require('object.assign');
+
+var _object2 = _interopRequireDefault(_object);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Extractor function for an ObjectExpression type value node.
+ * An object expression is using {}.
+ *
+ * @returns - a representation of the object
+ */
+function extractValueFromObjectExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  return value.properties.reduce(function (obj, property) {
+    var object = (0, _object2.default)({}, obj);
+    // Support types: SpreadProperty and ExperimentalSpreadProperty
+    if (/^(?:Experimental)?Spread(?:Property|Element)$/.test(property.type)) {
+      if (property.argument.type === 'ObjectExpression') {
+        return (0, _object2.default)(object, extractValueFromObjectExpression(property.argument));
+      }
+    } else {
+      object[getValue(property.key)] = getValue(property.value);
+    }
+    return object;
+  }, {});
+}

node_modules/jsx-ast-utils/lib/values/expressions/OptionalMemberExpression.js

@@ -0,0 +1,19 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromOptionalMemberExpression;
+/**
+ * Extractor function for a OptionalMemberExpression type value node.
+ * A member expression is accessing a property on an object `obj.property`.
+ *
+ * @param - value - AST Value object with type `OptionalMemberExpression`
+ * @returns - The extracted value converted to correct type
+ *  and maintaing `obj?.property` convention.
+ */
+function extractValueFromOptionalMemberExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  return getValue(value.object) + '?.' + getValue(value.property);
+}

node_modules/jsx-ast-utils/lib/values/expressions/SpreadElement.js

@@ -0,0 +1,17 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromSpreadElement;
+/**
+ * Extractor function for a SpreadElement type value node.
+ * We can't statically evaluate an array spread, so just return
+ * undefined.
+ *
+ * @param - value - AST Value object with type `SpreadElement`
+ * @returns - An prototypeless object.
+ */
+function extractValueFromSpreadElement() {
+  return undefined;
+}

node_modules/jsx-ast-utils/lib/values/expressions/TaggedTemplateExpression.js

@@ -0,0 +1,20 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromTaggedTemplateExpression;
+
+var _TemplateLiteral = require('./TemplateLiteral');
+
+var _TemplateLiteral2 = _interopRequireDefault(_TemplateLiteral);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Returns the string value of a tagged template literal object.
+ * Redirects the bulk of the work to `TemplateLiteral`.
+ */
+function extractValueFromTaggedTemplateExpression(value) {
+  return (0, _TemplateLiteral2.default)(value.quasi);
+}

node_modules/jsx-ast-utils/lib/values/expressions/TemplateLiteral.js

@@ -0,0 +1,40 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromTemplateLiteral;
+/**
+ * Returns the string value of a template literal object.
+ * Tries to build it as best as it can based on the passed
+ * prop. For instance `This is a ${prop}` will return 'This is a {prop}'.
+ *
+ * If the template literal builds to undefined (`${undefined}`), then
+ * this should return "undefined".
+ */
+function extractValueFromTemplateLiteral(value) {
+  var quasis = value.quasis,
+      expressions = value.expressions;
+
+  var partitions = quasis.concat(expressions);
+
+  return partitions.sort(function (a, b) {
+    return a.start - b.start;
+  }).reduce(function (raw, part) {
+    var type = part.type;
+
+    if (type === 'TemplateElement') {
+      return raw + part.value.raw;
+    }
+
+    if (type === 'Identifier') {
+      return part.name === 'undefined' ? '' + raw + part.name : raw + '{' + part.name + '}';
+    }
+
+    if (type.indexOf('Expression') > -1) {
+      return raw + '{' + type + '}';
+    }
+
+    return raw;
+  }, '');
+}

node_modules/jsx-ast-utils/lib/values/expressions/ThisExpression.js

@@ -0,0 +1,15 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromThisExpression;
+/**
+ * Extractor function for a ThisExpression type value node.
+ * A this expression is using `this` as an identifier.
+ *
+ * @returns - 'this' as a string.
+ */
+function extractValueFromThisExpression() {
+  return 'this';
+}

node_modules/jsx-ast-utils/lib/values/expressions/TypeCastExpression.js

@@ -0,0 +1,19 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromTypeCastExpression;
+/**
+ * Extractor function for a TypeCastExpression type value node.
+ * A type cast expression looks like `(this.handleClick: (event: MouseEvent) => void))`
+ * This will return the expression `this.handleClick`.
+ *
+ * @param - value - AST Value object with type `TypeCastExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromTypeCastExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  return getValue(value.expression);
+}

node_modules/jsx-ast-utils/lib/values/expressions/UnaryExpression.js

@@ -0,0 +1,39 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromUnaryExpression;
+/**
+ * Extractor function for a UnaryExpression type value node.
+ * A unary expression is an expression with a unary operator.
+ * For example, !"foobar" will evaluate to false, so this will return false.
+ *
+ * @param - value - AST Value object with type `UnaryExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromUnaryExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  var operator = value.operator,
+      argument = value.argument;
+
+
+  switch (operator) {
+    case '-':
+      return -getValue(argument);
+    case '+':
+      return +getValue(argument); // eslint-disable-line no-implicit-coercion
+    case '!':
+      return !getValue(argument);
+    case '~':
+      return ~getValue(argument); // eslint-disable-line no-bitwise
+    case 'delete':
+      // I believe delete statements evaluate to true.
+      return true;
+    case 'typeof':
+    case 'void':
+    default:
+      return undefined;
+  }
+}

node_modules/jsx-ast-utils/lib/values/expressions/UpdateExpression.js

@@ -0,0 +1,33 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromUpdateExpression;
+/**
+ * Extractor function for an UpdateExpression type value node.
+ * An update expression is an expression with an update operator.
+ * For example, foo++ will evaluate to foo + 1.
+ *
+ * @param - value - AST Value object with type `UpdateExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromUpdateExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('./index.js').default;
+  var operator = value.operator,
+      argument = value.argument,
+      prefix = value.prefix;
+
+
+  var val = getValue(argument);
+
+  switch (operator) {
+    case '++':
+      return prefix ? ++val : val++; // eslint-disable-line no-plusplus
+    case '--':
+      return prefix ? --val : val--; // eslint-disable-line no-plusplus
+    default:
+      return undefined;
+  }
+}

node_modules/jsx-ast-utils/lib/values/expressions/index.js

@@ -0,0 +1,244 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extract;
+exports.extractLiteral = extractLiteral;
+
+var _object = require('object.assign');
+
+var _object2 = _interopRequireDefault(_object);
+
+var _Literal = require('../Literal');
+
+var _Literal2 = _interopRequireDefault(_Literal);
+
+var _JSXElement = require('../JSXElement');
+
+var _JSXElement2 = _interopRequireDefault(_JSXElement);
+
+var _Identifier = require('./Identifier');
+
+var _Identifier2 = _interopRequireDefault(_Identifier);
+
+var _TaggedTemplateExpression = require('./TaggedTemplateExpression');
+
+var _TaggedTemplateExpression2 = _interopRequireDefault(_TaggedTemplateExpression);
+
+var _TemplateLiteral = require('./TemplateLiteral');
+
+var _TemplateLiteral2 = _interopRequireDefault(_TemplateLiteral);
+
+var _FunctionExpression = require('./FunctionExpression');
+
+var _FunctionExpression2 = _interopRequireDefault(_FunctionExpression);
+
+var _LogicalExpression = require('./LogicalExpression');
+
+var _LogicalExpression2 = _interopRequireDefault(_LogicalExpression);
+
+var _MemberExpression = require('./MemberExpression');
+
+var _MemberExpression2 = _interopRequireDefault(_MemberExpression);
+
+var _OptionalMemberExpression = require('./OptionalMemberExpression');
+
+var _OptionalMemberExpression2 = _interopRequireDefault(_OptionalMemberExpression);
+
+var _CallExpression = require('./CallExpression');
+
+var _CallExpression2 = _interopRequireDefault(_CallExpression);
+
+var _UnaryExpression = require('./UnaryExpression');
+
+var _UnaryExpression2 = _interopRequireDefault(_UnaryExpression);
+
+var _ThisExpression = require('./ThisExpression');
+
+var _ThisExpression2 = _interopRequireDefault(_ThisExpression);
+
+var _ConditionalExpression = require('./ConditionalExpression');
+
+var _ConditionalExpression2 = _interopRequireDefault(_ConditionalExpression);
+
+var _BinaryExpression = require('./BinaryExpression');
+
+var _BinaryExpression2 = _interopRequireDefault(_BinaryExpression);
+
+var _ObjectExpression = require('./ObjectExpression');
+
+var _ObjectExpression2 = _interopRequireDefault(_ObjectExpression);
+
+var _NewExpression = require('./NewExpression');
+
+var _NewExpression2 = _interopRequireDefault(_NewExpression);
+
+var _UpdateExpression = require('./UpdateExpression');
+
+var _UpdateExpression2 = _interopRequireDefault(_UpdateExpression);
+
+var _ArrayExpression = require('./ArrayExpression');
+
+var _ArrayExpression2 = _interopRequireDefault(_ArrayExpression);
+
+var _BindExpression = require('./BindExpression');
+
+var _BindExpression2 = _interopRequireDefault(_BindExpression);
+
+var _SpreadElement = require('./SpreadElement');
+
+var _SpreadElement2 = _interopRequireDefault(_SpreadElement);
+
+var _TypeCastExpression = require('./TypeCastExpression');
+
+var _TypeCastExpression2 = _interopRequireDefault(_TypeCastExpression);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+// Composition map of types to their extractor functions.
+var TYPES = {
+  Identifier: _Identifier2.default,
+  Literal: _Literal2.default,
+  JSXElement: _JSXElement2.default,
+  TaggedTemplateExpression: _TaggedTemplateExpression2.default,
+  TemplateLiteral: _TemplateLiteral2.default,
+  ArrowFunctionExpression: _FunctionExpression2.default,
+  FunctionExpression: _FunctionExpression2.default,
+  LogicalExpression: _LogicalExpression2.default,
+  MemberExpression: _MemberExpression2.default,
+  OptionalMemberExpression: _OptionalMemberExpression2.default,
+  CallExpression: _CallExpression2.default,
+  UnaryExpression: _UnaryExpression2.default,
+  ThisExpression: _ThisExpression2.default,
+  ConditionalExpression: _ConditionalExpression2.default,
+  BinaryExpression: _BinaryExpression2.default,
+  ObjectExpression: _ObjectExpression2.default,
+  NewExpression: _NewExpression2.default,
+  UpdateExpression: _UpdateExpression2.default,
+  ArrayExpression: _ArrayExpression2.default,
+  BindExpression: _BindExpression2.default,
+  SpreadElement: _SpreadElement2.default,
+  TypeCastExpression: _TypeCastExpression2.default
+};
+
+var noop = function noop() {
+  return null;
+};
+
+var errorMessage = function errorMessage(expression) {
+  return 'The prop value with an expression type of ' + expression + ' could not be resolved. Please file issue to get this fixed immediately.';
+};
+
+/**
+ * This function maps an AST value node
+ * to its correct extractor function for its
+ * given type.
+ *
+ * This will map correctly for *all* possible expression types.
+ *
+ * @param - value - AST Value object with type `JSXExpressionContainer`
+ * @returns The extracted value.
+ */
+function extract(value) {
+  // Value will not have the expression property when we recurse.
+  // The type for expression on ArrowFunctionExpression is a boolean.
+  var expression = void 0;
+  if (typeof value.expression !== 'boolean' && value.expression) {
+    expression = value.expression; // eslint-disable-line prefer-destructuring
+  } else {
+    expression = value;
+  }
+  var _expression = expression,
+      type = _expression.type;
+
+
+  while (type === 'TSNonNullExpression' || type === 'TSAsExpression') {
+    var _expression2 = expression;
+    type = _expression2.type;
+
+    if (expression.expression) {
+      var _expression3 = expression;
+      expression = _expression3.expression;
+    }
+  }
+
+  if (TYPES[type] === undefined) {
+    // eslint-disable-next-line no-console
+    console.error(errorMessage(type));
+    return null;
+  }
+
+  return TYPES[type](expression);
+}
+
+// Composition map of types to their extractor functions to handle literals.
+var LITERAL_TYPES = (0, _object2.default)({}, TYPES, {
+  Literal: function Literal(value) {
+    var extractedVal = TYPES.Literal.call(undefined, value);
+    var isNull = extractedVal === null;
+    // This will be convention for attributes that have null
+    // value explicitly defined (<div prop={null} /> maps to 'null').
+    return isNull ? 'null' : extractedVal;
+  },
+  Identifier: function Identifier(value) {
+    var isUndefined = TYPES.Identifier.call(undefined, value) === undefined;
+    return isUndefined ? undefined : null;
+  },
+  JSXElement: noop,
+  ArrowFunctionExpression: noop,
+  FunctionExpression: noop,
+  LogicalExpression: noop,
+  MemberExpression: noop,
+  OptionalMemberExpression: noop,
+  CallExpression: noop,
+  UnaryExpression: function UnaryExpression(value) {
+    var extractedVal = TYPES.UnaryExpression.call(undefined, value);
+    return extractedVal === undefined ? null : extractedVal;
+  },
+  UpdateExpression: function UpdateExpression(value) {
+    var extractedVal = TYPES.UpdateExpression.call(undefined, value);
+    return extractedVal === undefined ? null : extractedVal;
+  },
+  ThisExpression: noop,
+  ConditionalExpression: noop,
+  BinaryExpression: noop,
+  ObjectExpression: noop,
+  NewExpression: noop,
+  ArrayExpression: function ArrayExpression(value) {
+    var extractedVal = TYPES.ArrayExpression.call(undefined, value);
+    return extractedVal.filter(function (val) {
+      return val !== null;
+    });
+  },
+  BindExpression: noop,
+  SpreadElement: noop,
+  TSNonNullExpression: noop,
+  TSAsExpression: noop,
+  TypeCastExpression: noop
+});
+
+/**
+ * This function maps an AST value node
+ * to its correct extractor function for its
+ * given type.
+ *
+ * This will map correctly for *some* possible types that map to literals.
+ *
+ * @param - value - AST Value object with type `JSXExpressionContainer`
+ * @returns The extracted value.
+ */
+function extractLiteral(value) {
+  // Value will not have the expression property when we recurse.
+  var expression = value.expression || value;
+  var type = expression.type;
+
+
+  if (LITERAL_TYPES[type] === undefined) {
+    // eslint-disable-next-line no-console
+    console.error(errorMessage(type));
+    return null;
+  }
+
+  return LITERAL_TYPES[type](expression);
+}

node_modules/jsx-ast-utils/lib/values/index.js

@@ -0,0 +1,66 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getValue;
+exports.getLiteralValue = getLiteralValue;
+
+var _object = require('object.assign');
+
+var _object2 = _interopRequireDefault(_object);
+
+var _Literal = require('./Literal');
+
+var _Literal2 = _interopRequireDefault(_Literal);
+
+var _JSXElement = require('./JSXElement');
+
+var _JSXElement2 = _interopRequireDefault(_JSXElement);
+
+var _expressions = require('./expressions');
+
+var _expressions2 = _interopRequireDefault(_expressions);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+// Composition map of types to their extractor functions.
+var TYPES = {
+  Literal: _Literal2.default,
+  JSXElement: _JSXElement2.default,
+  JSXExpressionContainer: _expressions2.default
+};
+
+// Composition map of types to their extractor functions to handle literals.
+var LITERAL_TYPES = (0, _object2.default)({}, TYPES, {
+  JSXElement: function JSXElement() {
+    return null;
+  },
+  JSXExpressionContainer: _expressions.extractLiteral
+});
+
+/**
+ * This function maps an AST value node
+ * to its correct extractor function for its
+ * given type.
+ *
+ * This will map correctly for *all* possible types.
+ *
+ * @param value - AST Value object on a JSX Attribute.
+ */
+function getValue(value) {
+  return TYPES[value.type](value);
+}
+
+/**
+ * This function maps an AST value node
+ * to its correct extractor function for its
+ * given type.
+ *
+ * This will map correctly for *some* possible types that map to literals.
+ *
+ * @param value - AST Value object on a JSX Attribute.
+ */
+function getLiteralValue(value) {
+  return LITERAL_TYPES[value.type](value);
+}