diff options
Diffstat (limited to 'tools/node_modules/eslint/lib/rules/no-undef-init.js')
-rw-r--r-- | tools/node_modules/eslint/lib/rules/no-undef-init.js | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-undef-init.js b/tools/node_modules/eslint/lib/rules/no-undef-init.js new file mode 100644 index 0000000000..7e58f55a69 --- /dev/null +++ b/tools/node_modules/eslint/lib/rules/no-undef-init.js @@ -0,0 +1,63 @@ +/** + * @fileoverview Rule to flag when initializing to undefined + * @author Ilya Volodin + */ + +"use strict"; + +const astUtils = require("../ast-utils"); + +//------------------------------------------------------------------------------ +// Rule Definition +//------------------------------------------------------------------------------ + +module.exports = { + meta: { + docs: { + description: "disallow initializing variables to `undefined`", + category: "Variables", + recommended: false + }, + + schema: [], + + fixable: "code" + }, + + create(context) { + + const sourceCode = context.getSourceCode(); + + return { + + VariableDeclarator(node) { + const name = sourceCode.getText(node.id), + init = node.init && node.init.name, + scope = context.getScope(), + undefinedVar = astUtils.getVariableByName(scope, "undefined"), + shadowed = undefinedVar && undefinedVar.defs.length > 0; + + if (init === "undefined" && node.parent.kind !== "const" && !shadowed) { + context.report({ + node, + message: "It's not necessary to initialize '{{name}}' to undefined.", + data: { name }, + fix(fixer) { + if (node.parent.kind === "var") { + return null; + } + + if (node.id.type === "ArrayPattern" || node.id.type === "ObjectPattern") { + + // Don't fix destructuring assignment to `undefined`. + return null; + } + return fixer.removeRange([node.id.range[1], node.range[1]]); + } + }); + } + } + }; + + } +}; |