/
no-unneeded-ternary.js
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/
no-unneeded-ternary.js
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/**
* @fileoverview Tests for no-unneeded-ternary rule.
* @author Gyandeep Singh
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-unneeded-ternary"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("no-unneeded-ternary", rule, {
valid: [
"config.newIsCap = config.newIsCap !== false",
"var a = x === 2 ? 'Yes' : 'No';",
"var a = x === 2 ? true : 'No';",
"var a = x === 2 ? 'Yes' : false;",
"var a = x === 2 ? 'true' : 'false';",
"var a = foo ? foo : bar;",
"var value = 'a';var canSet = true;var result = value || (canSet ? 'unset' : 'can not set')",
"var a = foo ? bar : foo;",
"foo ? bar : foo;",
"var a = f(x ? x : 1)",
"f(x ? x : 1);",
"foo ? foo : bar;",
"var a = foo ? 'Yes' : foo;",
{
code: "var a = foo ? 'Yes' : foo;",
options: [{ defaultAssignment: false }]
},
{
code: "var a = foo ? bar : foo;",
options: [{ defaultAssignment: false }]
},
{
code: "foo ? bar : foo;",
options: [{ defaultAssignment: false }]
}
],
invalid: [
{
code: "var a = x === 2 ? true : false;",
output: "var a = x === 2;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 31
}]
},
{
code: "var a = x >= 2 ? true : false;",
output: "var a = x >= 2;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 30
}]
},
{
code: "var a = x ? true : false;",
output: "var a = !!x;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 25
}]
},
{
code: "var a = x === 1 ? false : true;",
output: "var a = x !== 1;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 31
}]
},
{
code: "var a = x != 1 ? false : true;",
output: "var a = x == 1;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 30
}]
},
{
code: "var a = foo() ? false : true;",
output: "var a = !foo();",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 29
}]
},
{
code: "var a = !foo() ? false : true;",
output: "var a = !!foo();",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 30
}]
},
{
code: "var a = foo + bar ? false : true;",
output: "var a = !(foo + bar);",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 33
}]
},
{
code: "var a = x instanceof foo ? false : true;",
output: "var a = !(x instanceof foo);",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 40
}]
},
{
code: "var a = foo ? false : false;",
output: "var a = false;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 28
}]
},
{
code: "var a = foo() ? false : false;",
output: null,
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 30
}]
},
{
code: "var a = x instanceof foo ? true : false;",
output: "var a = x instanceof foo;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 40
}]
},
{
code: "var a = !foo ? true : false;",
output: "var a = !foo;",
errors: [{
messageId: "unnecessaryConditionalExpression",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 28
}]
},
{
code: `
var value = 'a'
var canSet = true
var result = value ? value : canSet ? 'unset' : 'can not set'
`,
output: `
var value = 'a'
var canSet = true
var result = value || (canSet ? 'unset' : 'can not set')
`,
options: [{ defaultAssignment: false }],
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 4,
column: 30,
endLine: 4,
endColumn: 78
}]
},
{
code: "foo ? foo : (bar ? baz : qux)",
output: "foo || (bar ? baz : qux)",
options: [{ defaultAssignment: false }],
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 1,
endLine: 1,
endColumn: 30
}]
},
{
code: "function* fn() { foo ? foo : yield bar }",
output: "function* fn() { foo || (yield bar) }",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 18,
endLine: 1,
endColumn: 39
}]
},
{
code: "var a = foo ? foo : 'No';",
output: "var a = foo || 'No';",
options: [{ defaultAssignment: false }],
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 25
}]
},
{
code: "var a = ((foo)) ? (((((foo))))) : ((((((((((((((bar))))))))))))));",
output: "var a = ((foo)) || ((((((((((((((bar))))))))))))));",
options: [{ defaultAssignment: false }],
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 66
}]
},
{
code: "var a = b ? b : c => c;",
output: "var a = b || (c => c);",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2015 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 23
}]
},
{
code: "var a = b ? b : c = 0;",
output: "var a = b || (c = 0);",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2015 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 22
}]
},
{
code: "var a = b ? b : (c => c);",
output: "var a = b || (c => c);",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2015 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 25
}]
},
{
code: "var a = b ? b : (c = 0);",
output: "var a = b || (c = 0);",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2015 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 24
}]
},
{
code: "var a = b ? b : (c) => (c);",
output: "var a = b || ((c) => (c));",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2015 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 27
}]
},
{
code: "var a = b ? b : c, d; // this is ((b ? b : c), (d))",
output: "var a = b || c, d; // this is ((b ? b : c), (d))",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2015 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 18
}]
},
{
code: "var a = b ? b : (c, d);",
output: "var a = b || (c, d);",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2015 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 23
}]
},
{
code: "f(x ? x : 1);",
output: "f(x || 1);",
options: [{ defaultAssignment: false }],
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 3,
endLine: 1,
endColumn: 12
}]
},
{
code: "x ? x : 1;",
output: "x || 1;",
options: [{ defaultAssignment: false }],
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 1,
endLine: 1,
endColumn: 10
}]
},
{
code: "var a = foo ? foo : bar;",
output: "var a = foo || bar;",
options: [{ defaultAssignment: false }],
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 24
}]
},
{
code: "var a = foo ? foo : a ?? b;",
output: "var a = foo || (a ?? b);",
options: [{ defaultAssignment: false }],
parserOptions: { ecmaVersion: 2020 },
errors: [{
messageId: "unnecessaryConditionalAssignment",
type: "ConditionalExpression",
line: 1,
column: 9,
endLine: 1,
endColumn: 27
}]
}
]
});