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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js | |
parent | Initial commit. (diff) | |
download | firefox-upstream.tar.xz firefox-upstream.zip |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js')
-rw-r--r-- | tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js new file mode 100644 index 0000000000..4fd0734465 --- /dev/null +++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js @@ -0,0 +1,147 @@ +/** + * @fileoverview Reject common XPCOM methods called with useless optional + * parameters, or non-existent parameters. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +"use strict"; + +// ----------------------------------------------------------------------------- +// Rule Definition +// ----------------------------------------------------------------------------- + +module.exports = { + meta: { + type: "suggestion", + fixable: "code", + }, + create(context) { + function getRangeAfterArgToEnd(argNumber, args) { + let sourceCode = context.getSourceCode(); + return [ + sourceCode.getTokenAfter(args[argNumber]).range[0], + args[args.length - 1].range[1], + ]; + } + + // --------------------------------------------------------------------------- + // Public + // -------------------------------------------------------------------------- + + return { + CallExpression(node) { + let callee = node.callee; + if ( + callee.type !== "MemberExpression" || + callee.property.type !== "Identifier" + ) { + return; + } + + let isFalse = arg => arg.type === "Literal" && arg.value === false; + let isFalsy = arg => arg.type === "Literal" && !arg.value; + let isBool = arg => + arg.type === "Literal" && (arg.value === false || arg.value === true); + let name = callee.property.name; + let args = node.arguments; + + if ( + ["addEventListener", "removeEventListener", "addObserver"].includes( + name + ) && + args.length === 3 && + isFalse(args[2]) + ) { + context.report({ + node, + fix: fixer => { + return fixer.removeRange(getRangeAfterArgToEnd(1, args)); + }, + message: `${name}'s third parameter can be omitted when it's false.`, + }); + } + + if (name === "clearUserPref" && args.length > 1) { + context.report({ + node, + fix: fixer => { + return fixer.removeRange(getRangeAfterArgToEnd(0, args)); + }, + message: `${name} takes only 1 parameter.`, + }); + } + + if (name === "removeObserver" && args.length === 3 && isBool(args[2])) { + context.report({ + node, + fix: fixer => { + return fixer.removeRange(getRangeAfterArgToEnd(1, args)); + }, + message: "removeObserver only takes 2 parameters.", + }); + } + + if (name === "appendElement" && args.length === 2 && isFalse(args[1])) { + context.report({ + node, + fix: fixer => { + return fixer.removeRange(getRangeAfterArgToEnd(0, args)); + }, + message: `${name}'s second parameter can be omitted when it's false.`, + }); + } + + if ( + name === "notifyObservers" && + args.length === 3 && + isFalsy(args[2]) + ) { + context.report({ + node, + fix: fixer => { + return fixer.removeRange(getRangeAfterArgToEnd(1, args)); + }, + message: `${name}'s third parameter can be omitted.`, + }); + } + + if ( + name === "getComputedStyle" && + args.length === 2 && + isFalsy(args[1]) + ) { + context.report({ + node, + fix: fixer => { + return fixer.removeRange(getRangeAfterArgToEnd(0, args)); + }, + message: "getComputedStyle's second parameter can be omitted.", + }); + } + + if ( + name === "newURI" && + args.length > 1 && + isFalsy(args[args.length - 1]) + ) { + context.report({ + node, + fix: fixer => { + if (args.length > 2 && isFalsy(args[args.length - 2])) { + return fixer.removeRange(getRangeAfterArgToEnd(0, args)); + } + + return fixer.removeRange( + getRangeAfterArgToEnd(args.length - 2, args) + ); + }, + message: "newURI's last parameters are optional.", + }); + } + }, + }; + }, +}; |