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arrow-body-style.js
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arrow-body-style.js
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/**
* @fileoverview Tests for arrow-body-style
* @author Alberto Rodríguez
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/arrow-body-style"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
ruleTester.run("arrow-body-style", rule, {
valid: [
"var foo = () => {};",
"var foo = () => 0;",
"var addToB = (a) => { b = b + a };",
"var foo = () => { /* do nothing */ };",
"var foo = () => {\n /* do nothing */ \n};",
"var foo = (retv, name) => {\nretv[name] = true;\nreturn retv;\n};",
"var foo = () => ({});",
"var foo = () => bar();",
"var foo = () => { bar(); };",
"var foo = () => { b = a };",
"var foo = () => { bar: 1 };",
{ code: "var foo = () => { return 0; };", options: ["always"] },
{ code: "var foo = () => { return bar(); };", options: ["always"] },
{ code: "var foo = () => 0;", options: ["never"] },
{ code: "var foo = () => ({ foo: 0 });", options: ["never"] },
{ code: "var foo = () => {};", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var foo = () => 0;", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var addToB = (a) => { b = b + a };", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var foo = () => { /* do nothing */ };", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var foo = () => {\n /* do nothing */ \n};", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var foo = (retv, name) => {\nretv[name] = true;\nreturn retv;\n};", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var foo = () => bar();", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var foo = () => { bar(); };", options: ["as-needed", { requireReturnForObjectLiteral: true }] },
{ code: "var foo = () => { return { bar: 0 }; };", options: ["as-needed", { requireReturnForObjectLiteral: true }] }
],
invalid: [
{
code: "for (let a = (b, c, d) => { return vb && c in d; }; ;);",
output: "for (let a = (b, c, d) => (vb && c in d); ;);",
errors: [
{
line: 1,
column: 27,
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "for (let a = (b, c, d) => { return v in b && c in d; }; ;);",
output: "for (let a = (b, c, d) => (v in b && c in d); ;);",
errors: [
{
line: 1,
column: 27,
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "for (let a = (b, c, d) => { return vb in dd ; }; ;);",
output: "for (let a = (b, c, d) => (vb in dd ); ;);",
errors: [
{
line: 1,
column: 27,
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "for (let a = (b, c, d) => { return vb in c in dd ; }; ;);",
output: "for (let a = (b, c, d) => (vb in c in dd ); ;);",
errors: [
{
line: 1,
column: 27,
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => 0",
output: "var foo = () => {return 0}",
options: ["always"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "var foo = () => 0;",
output: "var foo = () => {return 0};",
options: ["always"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "var foo = () => ({});",
output: "var foo = () => {return {}};",
options: ["always"],
errors: [
{
line: 1,
column: 18,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "var foo = () => ( {});",
output: "var foo = () => {return {}};",
options: ["always"],
errors: [
{
line: 1,
column: 20,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "(() => ({}))",
output: "(() => {return {}})",
options: ["always"],
errors: [
{
line: 1,
column: 9,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "(() => ( {}))",
output: "(() => {return {}})",
options: ["always"],
errors: [
{
line: 1,
column: 10,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "var foo = () => { return 0; };",
output: "var foo = () => 0;",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return 0 };",
output: "var foo = () => 0;",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return bar(); };",
output: "var foo = () => bar();",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => {};",
output: null,
options: ["never"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedEmptyBlock"
}
]
},
{
code: "var foo = () => {\nreturn 0;\n};",
output: "var foo = () => 0;",
options: ["never"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return { bar: 0 }; };",
output: "var foo = () => ({ bar: 0 });",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedObjectBlock"
}
]
},
{
code: "var foo = () => { return ({ bar: 0 }); };",
output: "var foo = () => ({ bar: 0 });",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return a, b }",
output: "var foo = () => (a, b)",
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return };",
output: null, // not fixed
options: ["as-needed", { requireReturnForObjectLiteral: true }],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return; };",
output: null, // not fixed
options: ["as-needed", { requireReturnForObjectLiteral: true }],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return ( /* a */ {ok: true} /* b */ ) };",
output: "var foo = () => ( /* a */ {ok: true} /* b */ );",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return '{' };",
output: "var foo = () => '{';",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return { bar: 0 }.bar; };",
output: "var foo = () => ({ bar: 0 }.bar);",
options: ["as-needed"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedObjectBlock"
}
]
},
{
code: "var foo = (retv, name) => {\nretv[name] = true;\nreturn retv;\n};",
output: null, // not fixed
options: ["never"],
errors: [
{ line: 1, column: 27, type: "ArrowFunctionExpression", messageId: "unexpectedOtherBlock" }
]
},
{
code: "var foo = () => { return 0; };",
output: "var foo = () => 0;",
options: ["as-needed", { requireReturnForObjectLiteral: true }],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => { return bar(); };",
output: "var foo = () => bar();",
options: ["as-needed", { requireReturnForObjectLiteral: true }],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => ({});",
output: "var foo = () => {return {}};",
options: ["as-needed", { requireReturnForObjectLiteral: true }],
errors: [
{
line: 1,
column: 18,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "var foo = () => ({ bar: 0 });",
output: "var foo = () => {return { bar: 0 }};",
options: ["as-needed", { requireReturnForObjectLiteral: true }],
errors: [
{
line: 1,
column: 18,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "var foo = () => (((((((5)))))));",
output: "var foo = () => {return (((((((5)))))))};",
options: ["always"],
errors: [
{
line: 1,
column: 24,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
// Not fixed; fixing would cause ASI issues.
code:
"var foo = () => { return bar }\n" +
"[1, 2, 3].map(foo)",
output: null,
options: ["never"],
errors: [
{ line: 1, column: 17, type: "ArrowFunctionExpression", messageId: "unexpectedSingleBlock" }
]
},
{
// Not fixed; fixing would cause ASI issues.
code:
"var foo = () => { return bar }\n" +
"(1).toString();",
output: null,
options: ["never"],
errors: [
{ line: 1, column: 17, type: "ArrowFunctionExpression", messageId: "unexpectedSingleBlock" }
]
},
{
// Fixing here is ok because the arrow function has a semicolon afterwards.
code:
"var foo = () => { return bar };\n" +
"[1, 2, 3].map(foo)",
output:
"var foo = () => bar;\n" +
"[1, 2, 3].map(foo)",
options: ["never"],
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = /* a */ ( /* b */ ) /* c */ => /* d */ { /* e */ return /* f */ 5 /* g */ ; /* h */ } /* i */ ;",
output: "var foo = /* a */ ( /* b */ ) /* c */ => /* d */ /* e */ /* f */ 5 /* g */ /* h */ /* i */ ;",
options: ["as-needed"],
errors: [
{
line: 1,
column: 50,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = /* a */ ( /* b */ ) /* c */ => /* d */ ( /* e */ 5 /* f */ ) /* g */ ;",
output: "var foo = /* a */ ( /* b */ ) /* c */ => /* d */ {return ( /* e */ 5 /* f */ )} /* g */ ;",
options: ["always"],
errors: [
{
line: 1,
column: 60,
type: "ArrowFunctionExpression",
messageId: "expectedBlock"
}
]
},
{
code: "var foo = () => {\nreturn bar;\n};",
output: "var foo = () => bar;",
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => {\nreturn bar;};",
output: "var foo = () => bar;",
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: "var foo = () => {return bar;\n};",
output: "var foo = () => bar;",
errors: [
{
line: 1,
column: 17,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: `
var foo = () => {
return foo
.bar;
};
`,
output: `
var foo = () => foo
.bar;
`,
errors: [
{
line: 2,
column: 31,
type: "ArrowFunctionExpression",
messageId: "unexpectedSingleBlock"
}
]
},
{
code: `
var foo = () => {
return {
bar: 1,
baz: 2
};
};
`,
output: `
var foo = () => ({
bar: 1,
baz: 2
});
`,
errors: [
{
line: 2,
column: 31,
type: "ArrowFunctionExpression",
messageId: "unexpectedObjectBlock"
}
]
},
{
code: "var foo = () => ({foo: 1}).foo();",
output: "var foo = () => {return {foo: 1}.foo()};",
options: ["always"],
errors: [{ messageId: "expectedBlock" }]
},
{
code: "var foo = () => ({foo: 1}.foo());",
output: "var foo = () => {return {foo: 1}.foo()};",
options: ["always"],
errors: [{ messageId: "expectedBlock" }]
},
{
code: "var foo = () => ( {foo: 1} ).foo();",
output: "var foo = () => {return {foo: 1} .foo()};",
options: ["always"],
errors: [{ messageId: "expectedBlock" }]
},
{
code: `
var foo = () => ({
bar: 1,
baz: 2
});
`,
output: `
var foo = () => {return {
bar: 1,
baz: 2
}};
`,
options: ["always"],
errors: [{ messageId: "expectedBlock" }]
},
{
code: `
parsedYears = _map(years, (year) => (
{
index : year,
title : splitYear(year)
}
));
`,
output: `
parsedYears = _map(years, (year) => {
return {
index : year,
title : splitYear(year)
}
});
`,
options: ["always"],
errors: [{ messageId: "expectedBlock" }]
}
]
});