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fix: add preceding semicolon in suggestions of no-object-constructor #17649

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merged 4 commits into from Oct 17, 2023
Merged

fix: add preceding semicolon in suggestions of no-object-constructor #17649

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b704d9a
Add semicolon in suggestions of `no-object-constructor`
fasttime Oct 14, 2023
fecad74
Apply suggestions from code review
fasttime Oct 15, 2023
7db860a
`output` in test suggestions
fasttime Oct 17, 2023
b8e2e32
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fasttime Oct 17, 2023
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95 changes: 90 additions & 5 deletions lib/rules/no-object-constructor.js
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Expand Up @@ -9,7 +9,7 @@
// Requirements
//------------------------------------------------------------------------------

const { getVariableByName, isArrowToken } = require("./utils/ast-utils");
const { getVariableByName, isArrowToken, isClosingBraceToken, isClosingParenToken } = require("./utils/ast-utils");

//------------------------------------------------------------------------------
// Helpers
Expand Down Expand Up @@ -53,7 +53,8 @@ module.exports = {

messages: {
preferLiteral: "The object literal notation {} is preferable.",
useLiteral: "Replace with '{{replacement}}'."
useLiteral: "Replace with '{{replacement}}'.",
useLiteralAfterSemicolon: "Replace with '{{replacement}}', add implicit semicolon."
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}
},

Expand All @@ -80,6 +81,74 @@ module.exports = {
return false;
}

/**
* Determines whether a parenthesized object literal that replaces a specified node needs to be preceded by a semicolon.
* @param {ASTNode} node The node to be replaced.
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* @returns {boolean} Whether a semicolon is required before the parenthesized object literal.
*/
function needsSemicolon(node) {
const prevToken = sourceCode.getTokenBefore(node);

if (
!prevToken ||
prevToken.type === "Punctuator" && [":", ";", ">", "{", "=>", "++", "--"].includes(prevToken.value)
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) {
return false;
}

const prevNode = sourceCode.getNodeByRangeIndex(prevToken.range[0]);

if (isClosingParenToken(prevToken)) {
return ![
"DoWhileStatement",
"ForInStatement",
"ForOfStatement",
"ForStatement",
"IfStatement",
"WhileStatement",
"WithStatement"
].includes(prevNode.type);
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}

if (isClosingBraceToken(prevToken)) {
return (
prevNode.type === "BlockStatement" && prevNode.parent.type === "FunctionExpression" ||
prevNode.type === "ClassBody" && prevNode.parent.type === "ClassExpression" ||
prevNode.type === "ObjectExpression"
);
}

if (prevToken.type === "Identifier") {
return !["BreakStatement", "ContinueStatement"].includes(prevNode.parent.type);
}
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if (prevToken.type === "Keyword") {

// Keywords that can immediately precede an ExpressionStatement node, mapped to the their node types.
const nodeTypesByKeyword = {
__proto__: null,
break: "BreakStatement",
continue: "ContinueStatement",
debugger: "DebuggerStatement",
do: "DoWhileStatement",
else: "IfStatement",
return: "ReturnStatement",
while: "WhileStatement",
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yield: "YieldExpression"
};
const keyword = prevToken.value;
const nodeType = nodeTypesByKeyword[keyword];

return prevNode.type !== nodeType;
}

if (prevToken.type === "String") {
return !["ExportAllDeclaration", "ExportNamedDeclaration", "ImportDeclaration"].includes(prevNode.parent.type);
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}

return true;
}

/**
* Reports on nodes where the `Object` constructor is called without arguments.
* @param {ASTNode} node The node to evaluate.
Expand All @@ -93,16 +162,32 @@ module.exports = {
const variable = getVariableByName(sourceCode.getScope(node), "Object");

if (variable && variable.identifiers.length === 0) {
const replacement = needsParentheses(node) ? "({})" : "{}";
let replacement;
let fixText;
let messageId;
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if (needsParentheses(node)) {
replacement = "({})";
if (needsSemicolon(node)) {
fixText = ";({})";
messageId = "useLiteralAfterSemicolon";
} else {
fixText = "({})";
messageId = "useLiteral";
}
} else {
replacement = fixText = "{}";
messageId = "useLiteral";
}

context.report({
node,
messageId: "preferLiteral",
suggest: [
{
messageId: "useLiteral",
messageId,
data: { replacement },
fix: fixer => fixer.replaceText(node, replacement)
fix: fixer => fixer.replaceText(node, fixText)
}
]
});
Expand Down
245 changes: 244 additions & 1 deletion tests/lib/rules/no-object-constructor.js
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Expand Up @@ -104,6 +104,249 @@ ruleTester.run("no-object-constructor", rule, {
output: "({} instanceof Object);"
}]
}]
}
},

...[

// Semicolon required before `({})` to compensate for ASI
{
code: `
foo
Object()
`
},
{
code: `
foo()
Object()
`
},
{
code: `
new foo
Object()
`
},
{
code: `
(a++)
Object()
`
},
{
code: `
++a
Object()
`
},
{
code: `
const foo = function() {}
Object()
`
},
{
code: `
const foo = class {}
Object()
`
},
{
code: `
foo = this.return
Object()
`
},
{
code: `
var yield = bar.yield
Object()
`
},
{
code: `
var foo = { bar: baz }
Object()
`
}
].map(props => ({
...props,
errors: [{
messageId: "preferLiteral",
suggestions: [{
desc: "Replace with '({})', add implicit semicolon.",
messageId: "useLiteralAfterSemicolon"
}]
}]
})),

...[

// No semicolon required before `({})` because ASI does not occur
{ code: "Object()" },
{
code: `
{}
Object()
`
},
{
code: `
function foo() {}
Object()
`
},
{
code: `
class Foo {}
Object()
`
},
{ code: "foo: Object();" },
{ code: "foo();Object();" },
{ code: "{ Object(); }" },
{ code: "if (a) Object();" },
{ code: "if (a); else Object();" },
{ code: "while (a) Object();" },
{
code: `
do Object();
while (a);
`
},
{ code: "for (let i = 0; i < 10; i++) Object();" },
{ code: "for (const prop in obj) Object();" },
{ code: "for (const element of iterable) Object();" },
{ code: "with (obj) Object();" },

// No semicolon required before `({})` because ASI still occurs
{
code: `
const foo = () => {}
Object()
`
},
{
code: `
a++
Object()
`
},
{
code: `
a--
Object()
`
},
{
code: `
function foo() {
return
Object();
}
`
},
{
code: `
function * foo() {
yield
Object();
}
`
},
{
code: `
do {}
while (a)
Object()
`
},
{
code: `
debugger
Object()
`
},
{
code: `
for (;;) {
break
Object()
}
`
},
{
code: `
for (;;) {
continue
Object()
}
`
},
{
code: `
foo: break foo
Object()
`
},
{
code: `
foo: while (true) continue foo
Object()
`
},
{
code: `
<foo />
Object()
`,
parserOptions: { ecmaFeatures: { jsx: true } }
},
{
code: `
<foo></foo>
Object()
`,
parserOptions: { ecmaFeatures: { jsx: true } }
},
{
code: `
const foo = bar
export { foo }
Object()
`,
parserOptions: { sourceType: "module" }
},
{
code: `
export { foo } from 'bar'
Object()
`,
parserOptions: { sourceType: "module" }
},
{
code: `
export * as foo from 'bar'
Object()
`,
parserOptions: { sourceType: "module" }
},
{
code: `
import foo from 'bar'
Object()
`,
parserOptions: { sourceType: "module" }
}
].map(props => ({
...props,
errors: [{
messageId: "preferLiteral",
suggestions: [{
desc: "Replace with '({})'.",
messageId: "useLiteral"
}]
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}]
}))
]
});