diff options
Diffstat (limited to 'tools/node_modules/eslint/lib/rules/no-undef.js')
-rw-r--r-- | tools/node_modules/eslint/lib/rules/no-undef.js | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-undef.js b/tools/node_modules/eslint/lib/rules/no-undef.js new file mode 100644 index 0000000000..74a33dd997 --- /dev/null +++ b/tools/node_modules/eslint/lib/rules/no-undef.js @@ -0,0 +1,71 @@ +/** + * @fileoverview Rule to flag references to undeclared variables. + * @author Mark Macdonald + */ +"use strict"; + +//------------------------------------------------------------------------------ +// Helpers +//------------------------------------------------------------------------------ + +/** + * Checks if the given node is the argument of a typeof operator. + * @param {ASTNode} node The AST node being checked. + * @returns {boolean} Whether or not the node is the argument of a typeof operator. + */ +function hasTypeOfOperator(node) { + const parent = node.parent; + + return parent.type === "UnaryExpression" && parent.operator === "typeof"; +} + +//------------------------------------------------------------------------------ +// Rule Definition +//------------------------------------------------------------------------------ + +module.exports = { + meta: { + docs: { + description: "disallow the use of undeclared variables unless mentioned in `/*global */` comments", + category: "Variables", + recommended: true + }, + + schema: [ + { + type: "object", + properties: { + typeof: { + type: "boolean" + } + }, + additionalProperties: false + } + ] + }, + + create(context) { + const options = context.options[0]; + const considerTypeOf = options && options.typeof === true || false; + + return { + "Program:exit"(/* node */) { + const globalScope = context.getScope(); + + globalScope.through.forEach(ref => { + const identifier = ref.identifier; + + if (!considerTypeOf && hasTypeOfOperator(identifier)) { + return; + } + + context.report({ + node: identifier, + message: "'{{name}}' is not defined.", + data: identifier + }); + }); + } + }; + } +}; |