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feat: Allow languages to provide defaultLanguageOptions (#19003)
* feat: Default `languageOptions` for languages * don't pass `languageOptions` from CLI when not needed * update jsdoc * update RuleTester * add flat-config-array unit tests * add linter test with no language options * fix browser test * remove `languageOptions.parser` check from `RuleTester` * add RuleTester test with no language options * update docs * remove unnecessary check * use `??` instead of `||` Co-authored-by: Nicholas C. Zakas <[email protected]> * default `languageOptions` to an empty object --------- Co-authored-by: Nicholas C. Zakas <[email protected]>
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‎docs/src/extend/languages.md

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@@ -85,6 +85,7 @@ A basic `Language` object must implement the following:
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The following optional members allow you to customize how ESLint interacts with the object:
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* `visitorKeys` - visitor keys that are specific to the AST or CST. This is used to optimize traversal of the AST or CST inside of ESLint. While not required, it is strongly recommended, especially for AST or CST formats that deviate significantly from ESTree format.
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* `defaultLanguageOptions` - default `languageOptions` when the language is used. User-specified `languageOptions` are merged with this object when calculating the config for the file being linted.
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* `matchesSelectorClass(className, node, ancestry)` - allows you to specify selector classes, such as `:expression`, that match more than one node. This method is called whenever an [esquery](https://github.com/estools/esquery) selector contains a `:` followed by an identifier.
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See [`JSONLanguage`](https://github.com/eslint/json/blob/main/src/languages/json-language.js) as an example of a basic `Language` class.

‎lib/cli.js

Lines changed: 12 additions & 11 deletions
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@@ -146,24 +146,29 @@ async function translateOptions({
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overrideConfigFile = void 0;
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}
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149-
let globals = {};
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const languageOptions = {};
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if (global) {
152-
globals = global.reduce((obj, name) => {
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languageOptions.globals = global.reduce((obj, name) => {
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if (name.endsWith(":true")) {
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obj[name.slice(0, -5)] = "writable";
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} else {
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obj[name] = "readonly";
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}
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return obj;
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}, globals);
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}, {});
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}
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if (parserOptions) {
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languageOptions.parserOptions = parserOptions;
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}
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if (parser) {
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languageOptions.parser = await importer.import(parser);
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}
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overrideConfig = [{
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languageOptions: {
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globals,
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parserOptions: parserOptions || {}
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},
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...Object.keys(languageOptions).length > 0 ? { languageOptions } : {},
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rules: rule ? rule : {}
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}];
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@@ -175,10 +180,6 @@ async function translateOptions({
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};
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}
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if (parser) {
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overrideConfig[0].languageOptions.parser = await importer.import(parser);
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}
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if (plugin) {
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overrideConfig[0].plugins = await loadPlugins(importer, plugin);
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}

‎lib/config/config.js

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@@ -188,10 +188,6 @@ class Config {
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this.plugins = plugins;
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this.language = language;
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if (languageOptions) {
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this.languageOptions = languageOptions;
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}
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// Check language value
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const { pluginName: languagePluginName, objectName: localLanguageName } = splitPluginIdentifier(language);
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@@ -203,13 +199,20 @@ class Config {
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this.language = plugins[languagePluginName].languages[localLanguageName];
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202+
if (this.language.defaultLanguageOptions ?? languageOptions) {
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this.languageOptions = flatConfigSchema.languageOptions.merge(
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this.language.defaultLanguageOptions,
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languageOptions
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);
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} else {
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this.languageOptions = {};
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}
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// Validate language options
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if (this.languageOptions) {
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try {
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this.language.validateLanguageOptions(this.languageOptions);
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} catch (error) {
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throw new TypeError(`Key "languageOptions": ${error.message}`, { cause: error });
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}
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try {
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this.language.validateLanguageOptions(this.languageOptions);
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} catch (error) {
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throw new TypeError(`Key "languageOptions": ${error.message}`, { cause: error });
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}
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// Check processor value

‎lib/config/default-config.js

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@@ -42,12 +42,6 @@ exports.defaultConfig = Object.freeze([
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}
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},
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language: "@/js",
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languageOptions: {
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sourceType: "module",
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ecmaVersion: "latest",
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parser: require("espree"),
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parserOptions: {}
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},
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linterOptions: {
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reportUnusedDisableDirectives: 1
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}

‎lib/languages/js/index.js

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@@ -12,6 +12,7 @@
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const { SourceCode } = require("./source-code");
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const createDebug = require("debug");
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const astUtils = require("../../shared/ast-utils");
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const espree = require("espree");
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const eslintScope = require("eslint-scope");
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const evk = require("eslint-visitor-keys");
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const { validateLanguageOptions } = require("./validate-language-options");
@@ -69,6 +70,13 @@ module.exports = {
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nodeTypeKey: "type",
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visitorKeys: evk.KEYS,
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defaultLanguageOptions: {
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sourceType: "module",
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ecmaVersion: "latest",
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parser: espree,
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parserOptions: {}
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},
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validateLanguageOptions,
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/**

‎lib/linter/linter.js

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@@ -1643,29 +1643,26 @@ class Linter {
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const options = normalizeVerifyOptions(providedOptions, config);
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const languageOptions = config.languageOptions;
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1646-
languageOptions.ecmaVersion = normalizeEcmaVersionForLanguageOptions(
1647-
languageOptions.ecmaVersion
1648-
);
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// double check that there is a parser to avoid mysterious error messages
1651-
if (!languageOptions.parser) {
1652-
throw new TypeError(`No parser specified for ${options.filename}`);
1653-
}
1646+
if (config.language === jslang) {
1647+
languageOptions.ecmaVersion = normalizeEcmaVersionForLanguageOptions(
1648+
languageOptions.ecmaVersion
1649+
);
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1655-
// Espree expects this information to be passed in
1656-
if (isEspree(languageOptions.parser)) {
1657-
const parserOptions = languageOptions.parserOptions;
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// Espree expects this information to be passed in
1652+
if (isEspree(languageOptions.parser)) {
1653+
const parserOptions = languageOptions.parserOptions;
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1659-
if (languageOptions.sourceType) {
1655+
if (languageOptions.sourceType) {
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1661-
parserOptions.sourceType = languageOptions.sourceType;
1657+
parserOptions.sourceType = languageOptions.sourceType;
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1663-
if (
1664-
parserOptions.sourceType === "module" &&
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parserOptions.ecmaFeatures &&
1666-
parserOptions.ecmaFeatures.globalReturn
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) {
1668-
parserOptions.ecmaFeatures.globalReturn = false;
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if (
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parserOptions.sourceType === "module" &&
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parserOptions.ecmaFeatures &&
1662+
parserOptions.ecmaFeatures.globalReturn
1663+
) {
1664+
parserOptions.ecmaFeatures.globalReturn = false;
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}
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}
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}
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}

‎lib/rule-tester/rule-tester.js

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@@ -30,6 +30,7 @@ const parserSymbol = Symbol.for("eslint.RuleTester.parser");
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const { ConfigArraySymbol } = require("@eslint/config-array");
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const { isSerializable } = require("../shared/serialization");
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const jslang = require("../languages/js");
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const { SourceCode } = require("../languages/js/source-code");
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//------------------------------------------------------------------------------
@@ -619,10 +620,7 @@ class RuleTester {
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}
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}
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},
622-
language: defaultConfig[0].language,
623-
languageOptions: {
624-
...defaultConfig[0].languageOptions
625-
}
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language: defaultConfig[0].language
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},
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...defaultConfig.slice(1)
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];
@@ -673,7 +671,10 @@ class RuleTester {
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const calculatedConfig = proto[ConfigArraySymbol.finalizeConfig].apply(this, args);
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// wrap the parser to catch start/end property access
676-
calculatedConfig.languageOptions.parser = wrapParser(calculatedConfig.languageOptions.parser);
674+
if (calculatedConfig.language === jslang) {
675+
calculatedConfig.languageOptions.parser = wrapParser(calculatedConfig.languageOptions.parser);
676+
}
677+
677678
return calculatedConfig;
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};
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@@ -694,17 +695,6 @@ class RuleTester {
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delete itemConfig[parameter];
695696
}
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697-
// wrap any parsers
698-
if (itemConfig.languageOptions && itemConfig.languageOptions.parser) {
699-
700-
const parser = itemConfig.languageOptions.parser;
701-
702-
if (parser && typeof parser !== "object") {
703-
throw new Error("Parser must be an object with a parse() or parseForESLint() method.");
704-
}
705-
706-
}
707-
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/*
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* Create the config object from the tester config and this item
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* specific configurations.

‎tests/lib/cli-engine/cli-engine.js

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@@ -923,13 +923,15 @@ describe("CLIEngine", () => {
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924924
engine = new CLIEngine({
925925
parser: "esprima",
926-
useEslintrc: false
926+
useEslintrc: false,
927+
ignore: false
927928
});
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929-
const report = engine.executeOnFiles(["lib/cli.js"]);
930+
const report = engine.executeOnFiles(["tests/fixtures/simple-valid-project/foo.js"]);
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931932
assert.strictEqual(report.results.length, 1);
932933
assert.strictEqual(report.results[0].messages.length, 0);
934+
933935
assert.strictEqual(report.results[0].suppressedMessages.length, 0);
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});
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