diff options
Diffstat (limited to 'tools/node_modules/eslint/lib/rules/no-undefined.js')
-rw-r--r-- | tools/node_modules/eslint/lib/rules/no-undefined.js | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-undefined.js b/tools/node_modules/eslint/lib/rules/no-undefined.js new file mode 100644 index 0000000000..7e9f96b921 --- /dev/null +++ b/tools/node_modules/eslint/lib/rules/no-undefined.js @@ -0,0 +1,77 @@ +/** + * @fileoverview Rule to flag references to the undefined variable. + * @author Michael Ficarra + */ +"use strict"; + +//------------------------------------------------------------------------------ +// Rule Definition +//------------------------------------------------------------------------------ + +module.exports = { + meta: { + docs: { + description: "disallow the use of `undefined` as an identifier", + category: "Variables", + recommended: false + }, + + schema: [] + }, + + create(context) { + + /** + * Report an invalid "undefined" identifier node. + * @param {ASTNode} node The node to report. + * @returns {void} + */ + function report(node) { + context.report({ + node, + message: "Unexpected use of undefined." + }); + } + + /** + * Checks the given scope for references to `undefined` and reports + * all references found. + * @param {eslint-scope.Scope} scope The scope to check. + * @returns {void} + */ + function checkScope(scope) { + const undefinedVar = scope.set.get("undefined"); + + if (!undefinedVar) { + return; + } + + const references = undefinedVar.references; + + const defs = undefinedVar.defs; + + // Report non-initializing references (those are covered in defs below) + references + .filter(ref => !ref.init) + .forEach(ref => report(ref.identifier)); + + defs.forEach(def => report(def.name)); + } + + return { + "Program:exit"() { + const globalScope = context.getScope(); + + const stack = [globalScope]; + + while (stack.length) { + const scope = stack.pop(); + + stack.push.apply(stack, scope.childScopes); + checkScope(scope); + } + } + }; + + } +}; |