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comma-dangle.js
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comma-dangle.js
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/**
* @fileoverview Tests for comma-dangle rule.
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const path = require("path"),
rule = require("../../../lib/rules/comma-dangle"),
RuleTester = require("../../../lib/testers/rule-tester");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Gets the path to the parser of the given name.
*
* @param {string} name - The name of a parser to get.
* @returns {string} The path to the specified parser.
*/
function parser(name) {
return path.resolve(
__dirname,
`../../fixtures/parsers/comma-dangle/${name}.js`
);
}
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("comma-dangle", rule, {
valid: [
"var foo = { bar: 'baz' }",
"var foo = {\nbar: 'baz'\n}",
"var foo = [ 'baz' ]",
"var foo = [\n'baz'\n]",
"[,,]",
"[\n,\n,\n]",
"[,]",
"[\n,\n]",
"[]",
"[\n]",
{ code: "var foo = [\n (bar ? baz : qux),\n ];", options: ["always-multiline"] },
{ code: "var foo = { bar: 'baz' }", options: ["never"] },
{ code: "var foo = {\nbar: 'baz'\n}", options: ["never"] },
{ code: "var foo = [ 'baz' ]", options: ["never"] },
{ code: "var { a, b } = foo;", options: ["never"], parserOptions: { ecmaVersion: 6 } },
{ code: "var [ a, b ] = foo;", options: ["never"], parserOptions: { ecmaVersion: 6 } },
{ code: "var { a,\n b, \n} = foo;", options: ["only-multiline"], parserOptions: { ecmaVersion: 6 } },
{ code: "var [ a,\n b, \n] = foo;", options: ["only-multiline"], parserOptions: { ecmaVersion: 6 } },
{ code: "[(1),]", options: ["always"] },
{ code: "var x = { foo: (1),};", options: ["always"] },
{ code: "var foo = { bar: 'baz', }", options: ["always"] },
{ code: "var foo = {\nbar: 'baz',\n}", options: ["always"] },
{ code: "var foo = {\nbar: 'baz'\n,}", options: ["always"] },
{ code: "var foo = [ 'baz', ]", options: ["always"] },
{ code: "var foo = [\n'baz',\n]", options: ["always"] },
{ code: "var foo = [\n'baz'\n,]", options: ["always"] },
{ code: "[,,]", options: ["always"] },
{ code: "[\n,\n,\n]", options: ["always"] },
{ code: "[,]", options: ["always"] },
{ code: "[\n,\n]", options: ["always"] },
{ code: "[]", options: ["always"] },
{ code: "[\n]", options: ["always"] },
{ code: "var foo = { bar: 'baz' }", options: ["always-multiline"] },
{ code: "var foo = { bar: 'baz' }", options: ["only-multiline"] },
{ code: "var foo = {\nbar: 'baz',\n}", options: ["always-multiline"] },
{ code: "var foo = {\nbar: 'baz',\n}", options: ["only-multiline"] },
{ code: "var foo = [ 'baz' ]", options: ["always-multiline"] },
{ code: "var foo = [ 'baz' ]", options: ["only-multiline"] },
{ code: "var foo = [\n'baz',\n]", options: ["always-multiline"] },
{ code: "var foo = [\n'baz',\n]", options: ["only-multiline"] },
{ code: "var foo = { bar:\n\n'bar' }", options: ["always-multiline"] },
{ code: "var foo = { bar:\n\n'bar' }", options: ["only-multiline"] },
{ code: "var foo = {a: 1, b: 2, c: 3, d: 4}", options: ["always-multiline"] },
{ code: "var foo = {a: 1, b: 2, c: 3, d: 4}", options: ["only-multiline"] },
{ code: "var foo = {a: 1, b: 2,\n c: 3, d: 4}", options: ["always-multiline"] },
{ code: "var foo = {a: 1, b: 2,\n c: 3, d: 4}", options: ["only-multiline"] },
{ code: "var foo = {x: {\nfoo: 'bar',\n}}", options: ["always-multiline"] },
{ code: "var foo = {x: {\nfoo: 'bar',\n}}", options: ["only-multiline"] },
{ code: "var foo = new Map([\n[key, {\na: 1,\nb: 2,\nc: 3,\n}],\n])", options: ["always-multiline"] },
{ code: "var foo = new Map([\n[key, {\na: 1,\nb: 2,\nc: 3,\n}],\n])", options: ["only-multiline"] },
// https://github.com/eslint/eslint/issues/3627
{
code: "var [a, ...rest] = [];",
options: ["always"],
parserOptions: { ecmaVersion: 6 }
},
{
code: "var [\n a,\n ...rest\n] = [];",
options: ["always"],
parserOptions: { ecmaVersion: 6 }
},
{
code: "var [\n a,\n ...rest\n] = [];",
options: ["always-multiline"],
parserOptions: { ecmaVersion: 6 }
},
{
code: "var [\n a,\n ...rest\n] = [];",
options: ["only-multiline"],
parserOptions: { ecmaVersion: 6 }
},
{
code: "[a, ...rest] = [];",
options: ["always"],
parserOptions: { ecmaVersion: 6 }
},
{
code: "for ([a, ...rest] of []);",
options: ["always"],
parserOptions: { ecmaVersion: 6 }
},
{
code: "var a = [b, ...spread,];",
options: ["always"],
parserOptions: { ecmaVersion: 6 }
},
// https://github.com/eslint/eslint/issues/7297
{
code: "var {foo, ...bar} = baz",
options: ["always"],
parserOptions: { ecmaVersion: 8, ecmaFeatures: { experimentalObjectRestSpread: true } }
},
{
code: "var {foo, ...bar} = baz",
options: ["always"],
parserOptions: { ecmaVersion: 2018 }
},
// https://github.com/eslint/eslint/issues/3794
{
code: "import {foo,} from 'foo';",
options: ["always"],
parserOptions: { sourceType: "module" }
},
{
code: "import foo from 'foo';",
options: ["always"],
parserOptions: { sourceType: "module" }
},
{
code: "import foo, {abc,} from 'foo';",
options: ["always"],
parserOptions: { sourceType: "module" }
},
{
code: "import * as foo from 'foo';",
options: ["always"],
parserOptions: { sourceType: "module" }
},
{
code: "export {foo,} from 'foo';",
options: ["always"],
parserOptions: { sourceType: "module" }
},
{
code: "import {foo} from 'foo';",
options: ["never"],
parserOptions: { sourceType: "module" }
},
{
code: "import foo from 'foo';",
options: ["never"],
parserOptions: { sourceType: "module" }
},
{
code: "import foo, {abc} from 'foo';",
options: ["never"],
parserOptions: { sourceType: "module" }
},
{
code: "import * as foo from 'foo';",
options: ["never"],
parserOptions: { sourceType: "module" }
},
{
code: "export {foo} from 'foo';",
options: ["never"],
parserOptions: { sourceType: "module" }
},
{
code: "import {foo} from 'foo';",
options: ["always-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "import {foo} from 'foo';",
options: ["only-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "export {foo} from 'foo';",
options: ["always-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "export {foo} from 'foo';",
options: ["only-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "import {\n foo,\n} from 'foo';",
options: ["always-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "import {\n foo,\n} from 'foo';",
options: ["only-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "export {\n foo,\n} from 'foo';",
options: ["always-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "export {\n foo,\n} from 'foo';",
options: ["only-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "import {foo} from \n'foo';",
options: ["always-multiline"],
parserOptions: { sourceType: "module" }
},
{
code: "import {foo} from \n'foo';",
options: ["only-multiline"],
parserOptions: { sourceType: "module" }
},
// trailing comma in functions -- ignore by default
{
code: "function foo(a,) {}",
options: ["never"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a,)",
options: ["never"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(a) {}",
options: ["always"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a)",
options: ["always"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(\na,\nb\n) {}",
options: ["always-multiline"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(\na,b)",
options: ["always-multiline"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(a,b,) {}",
options: ["always-multiline"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a,b,)",
options: ["always-multiline"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(a,b,) {}",
options: ["only-multiline"],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a,b,)",
options: ["only-multiline"],
parserOptions: { ecmaVersion: 8 }
},
// trailing comma in functions
{
code: "function foo(a) {} ",
options: [{ functions: "never" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a)",
options: [{ functions: "never" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(a,) {}",
options: [{ functions: "always" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function bar(a, ...b) {}",
options: [{ functions: "always" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a,)",
options: [{ functions: "always" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "bar(...a,)",
options: [{ functions: "always" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(a) {} ",
options: [{ functions: "always-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a)",
options: [{ functions: "always-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(\na,\nb,\n) {} ",
options: [{ functions: "always-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(\na,\n...b\n) {} ",
options: [{ functions: "always-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(\na,\nb,\n)",
options: [{ functions: "always-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(\na,\n...b,\n)",
options: [{ functions: "always-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(a) {} ",
options: [{ functions: "only-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(a)",
options: [{ functions: "only-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(\na,\nb,\n) {} ",
options: [{ functions: "only-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(\na,\nb,\n)",
options: [{ functions: "only-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "function foo(\na,\nb\n) {} ",
options: [{ functions: "only-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
{
code: "foo(\na,\nb\n)",
options: [{ functions: "only-multiline" }],
parserOptions: { ecmaVersion: 8 }
},
// https://github.com/eslint/eslint/issues/7370
{
code: "function foo({a}: {a: string,}) {}",
options: ["never"],
parser: parser("object-pattern-1")
},
{
code: "function foo({a,}: {a: string}) {}",
options: ["always"],
parser: parser("object-pattern-2")
},
{
code: "function foo(a): {b: boolean,} {}",
options: [{ functions: "never" }],
parser: parser("return-type-1")
},
{
code: "function foo(a,): {b: boolean} {}",
options: [{ functions: "always" }],
parser: parser("return-type-2")
}
],
invalid: [
{
code: "var foo = { bar: 'baz', }",
output: "var foo = { bar: 'baz' }",
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 23
}
]
},
{
code: "var foo = {\nbar: 'baz',\n}",
output: "var foo = {\nbar: 'baz'\n}",
errors: [
{
messageId: "unexpected",
type: "Property",
line: 2,
column: 11
}
]
},
{
code: "foo({ bar: 'baz', qux: 'quux', });",
output: "foo({ bar: 'baz', qux: 'quux' });",
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 30
}
]
},
{
code: "foo({\nbar: 'baz',\nqux: 'quux',\n});",
output: "foo({\nbar: 'baz',\nqux: 'quux'\n});",
errors: [
{
messageId: "unexpected",
type: "Property",
line: 3,
column: 12
}
]
},
{
code: "var foo = [ 'baz', ]",
output: "var foo = [ 'baz' ]",
errors: [
{
messageId: "unexpected",
type: "Literal",
line: 1,
column: 18
}
]
},
{
code: "var foo = [ 'baz',\n]",
output: "var foo = [ 'baz'\n]",
errors: [
{
messageId: "unexpected",
type: "Literal",
line: 1,
column: 18
}
]
},
{
code: "var foo = { bar: 'bar'\n\n, }",
output: "var foo = { bar: 'bar'\n\n }",
errors: [
{
messageId: "unexpected",
type: "Property",
line: 3,
column: 1
}
]
},
{
code: "var foo = { bar: 'baz', }",
output: "var foo = { bar: 'baz' }",
options: ["never"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 23
}
]
},
{
code: "var foo = { bar: 'baz', }",
output: "var foo = { bar: 'baz' }",
options: ["only-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 23
}
]
},
{
code: "var foo = {\nbar: 'baz',\n}",
output: "var foo = {\nbar: 'baz'\n}",
options: ["never"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 2,
column: 11
}
]
},
{
code: "foo({ bar: 'baz', qux: 'quux', });",
output: "foo({ bar: 'baz', qux: 'quux' });",
options: ["never"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 30
}
]
},
{
code: "foo({ bar: 'baz', qux: 'quux', });",
output: "foo({ bar: 'baz', qux: 'quux' });",
options: ["only-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 30
}
]
},
{
code: "var foo = { bar: 'baz' }",
output: "var foo = { bar: 'baz', }",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Property",
line: 1,
column: 23
}
]
},
{
code: "var foo = {\nbar: 'baz'\n}",
output: "var foo = {\nbar: 'baz',\n}",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Property",
line: 2,
column: 11
}
]
},
{
code: "foo({ bar: 'baz', qux: 'quux' });",
output: "foo({ bar: 'baz', qux: 'quux', });",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Property",
line: 1,
column: 30
}
]
},
{
code: "foo({\nbar: 'baz',\nqux: 'quux'\n});",
output: "foo({\nbar: 'baz',\nqux: 'quux',\n});",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Property",
line: 3,
column: 12
}
]
},
{
code: "var foo = [ 'baz' ]",
output: "var foo = [ 'baz', ]",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Literal",
line: 1,
column: 18
}
]
},
{
code: "var foo = [ 'baz'\n]",
output: "var foo = [ 'baz',\n]",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Literal",
line: 1,
column: 18
}
]
},
{
code: "var foo = { bar:\n\n'bar' }",
output: "var foo = { bar:\n\n'bar', }",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Property",
line: 3,
column: 6
}
]
},
{
code: "var foo = {\nbar: 'baz'\n}",
output: "var foo = {\nbar: 'baz',\n}",
options: ["always-multiline"],
errors: [
{
messageId: "missing",
type: "Property",
line: 2,
column: 11
}
]
},
{
code:
"var foo = [\n" +
" bar,\n" +
" (\n" +
" baz\n" +
" )\n" +
"];",
output:
"var foo = [\n" +
" bar,\n" +
" (\n" +
" baz\n" +
" ),\n" +
"];",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Identifier",
line: 5,
column: 4
}
]
},
{
code:
"var foo = {\n" +
" foo: 'bar',\n" +
" baz: (\n" +
" qux\n" +
" )\n" +
"};",
output:
"var foo = {\n" +
" foo: 'bar',\n" +
" baz: (\n" +
" qux\n" +
" ),\n" +
"};",
options: ["always"],
errors: [
{
messageId: "missing",
type: "Property",
line: 5,
column: 4
}
]
},
{
// https://github.com/eslint/eslint/issues/7291
code:
"var foo = [\n" +
" (bar\n" +
" ? baz\n" +
" : qux\n" +
" )\n" +
"];",
output:
"var foo = [\n" +
" (bar\n" +
" ? baz\n" +
" : qux\n" +
" ),\n" +
"];",
options: ["always"],
errors: [
{
messageId: "missing",
type: "ConditionalExpression",
line: 5,
column: 4
}
]
},
{
code: "var foo = { bar: 'baz', }",
output: "var foo = { bar: 'baz' }",
options: ["always-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 23
}
]
},
{
code: "foo({\nbar: 'baz',\nqux: 'quux'\n});",
output: "foo({\nbar: 'baz',\nqux: 'quux',\n});",
options: ["always-multiline"],
errors: [
{
messageId: "missing",
type: "Property",
line: 3,
column: 12
}
]
},
{
code: "foo({ bar: 'baz', qux: 'quux', });",
output: "foo({ bar: 'baz', qux: 'quux' });",
options: ["always-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 30
}
]
},
{
code: "var foo = [\n'baz'\n]",
output: "var foo = [\n'baz',\n]",
options: ["always-multiline"],
errors: [
{
messageId: "missing",
type: "Literal",
line: 2,
column: 6
}
]
},
{
code: "var foo = ['baz',]",
output: "var foo = ['baz']",
options: ["always-multiline"],
errors: [
{
messageId: "unexpected",
type: "Literal",
line: 1,
column: 17
}
]
},
{
code: "var foo = ['baz',]",
output: "var foo = ['baz']",
options: ["only-multiline"],
errors: [
{
messageId: "unexpected",
type: "Literal",
line: 1,
column: 17
}
]
},
{
code: "var foo = {x: {\nfoo: 'bar',\n},}",
output: "var foo = {x: {\nfoo: 'bar',\n}}",
options: ["always-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 3,
column: 2
}
]
},
{
code: "var foo = {a: 1, b: 2,\nc: 3, d: 4,}",
output: "var foo = {a: 1, b: 2,\nc: 3, d: 4}",
options: ["always-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 2,
column: 11
}
]
},
{
code: "var foo = {a: 1, b: 2,\nc: 3, d: 4,}",
output: "var foo = {a: 1, b: 2,\nc: 3, d: 4}",
options: ["only-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 2,
column: 11
}
]
},
{
code: "var foo = [{\na: 1,\nb: 2,\nc: 3,\nd: 4,\n},]",
output: "var foo = [{\na: 1,\nb: 2,\nc: 3,\nd: 4,\n}]",
options: ["always-multiline"],
errors: [
{
messageId: "unexpected",
type: "ObjectExpression",
line: 6,
column: 2
}
]
},
{
code: "var { a, b, } = foo;",
output: "var { a, b } = foo;",
options: ["never"],
parserOptions: { ecmaVersion: 6 },
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 11
}
]
},
{
code: "var { a, b, } = foo;",
output: "var { a, b } = foo;",
options: ["only-multiline"],
parserOptions: { ecmaVersion: 6 },
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 11
}
]
},
{
code: "var [ a, b, ] = foo;",
output: "var [ a, b ] = foo;",
options: ["never"],
parserOptions: { ecmaVersion: 6 },
errors: [
{
messageId: "unexpected",
type: "Identifier",
line: 1,
column: 11
}
]
},
{
code: "var [ a, b, ] = foo;",
output: "var [ a, b ] = foo;",
options: ["only-multiline"],
parserOptions: { ecmaVersion: 6 },
errors: [
{
messageId: "unexpected",
type: "Identifier",
line: 1,
column: 11
}
]
},
{
code: "[(1),]",
output: "[(1)]",
options: ["never"],
errors: [
{
messageId: "unexpected",
type: "Literal",
line: 1,
column: 5
}
]
},
{
code: "[(1),]",
output: "[(1)]",
options: ["only-multiline"],
errors: [
{
messageId: "unexpected",
type: "Literal",
line: 1,
column: 5
}
]
},
{
code: "var x = { foo: (1),};",
output: "var x = { foo: (1)};",
options: ["never"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 19
}
]
},
{
code: "var x = { foo: (1),};",
output: "var x = { foo: (1)};",
options: ["only-multiline"],
errors: [
{
messageId: "unexpected",
type: "Property",
line: 1,
column: 19
}
]
},
// https://github.com/eslint/eslint/issues/3794
{
code: "import {foo} from 'foo';",
output: "import {foo,} from 'foo';",
options: ["always"],
parserOptions: { sourceType: "module" },
errors: [{ messageId: "missing", type: "ImportSpecifier" }]
},
{
code: "import foo, {abc} from 'foo';",
output: "import foo, {abc,} from 'foo';",
options: ["always"],
parserOptions: { sourceType: "module" },
errors: [{ messageId: "missing", type: "ImportSpecifier" }]
},