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[Fix] no-duplicates with type imports #2716

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[Fix] no-duplicates with type imports #2716

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3e73216
[Fix]: no-duplicates with type imports
snewcomer Jan 29, 2023
5592e87
Update src/rules/no-duplicates.js
snewcomer Feb 19, 2023
eadc552
Update src/rules/no-duplicates.js
snewcomer Feb 19, 2023
8a8655b
Update src/rules/no-duplicates.js
snewcomer Feb 19, 2023
965a6ba
Update src/rules/no-duplicates.js
snewcomer Feb 19, 2023
b7b9a56
Update src/rules/no-duplicates.js
snewcomer Feb 19, 2023
085adc8
one bugfix with trailing commas
snewcomer Feb 19, 2023
59e4332
try this way instead
snewcomer Feb 19, 2023
0d2b737
moar feedback
snewcomer Feb 20, 2023
864effb
comment out for now
snewcomer Jul 28, 2023
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238 changes: 222 additions & 16 deletions src/rules/no-duplicates.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,11 +29,203 @@ function checkImports(imported, context) {
message,
});
}

}
}
}

function getFix(first, rest, sourceCode, context) {
function checkTypeImports(imported, context) {
Array.from(imported).forEach(([module, nodes]) => {
const typeImports = nodes.filter((node) => node.importKind === 'type');
if (nodes.length > 1) {
const someInlineTypeImports = nodes.some((node) => node.specifiers.some((spec) => spec.importKind === 'type'));
if (typeImports.length > 0 && someInlineTypeImports) {
const message = `'${module}' imported multiple times.`;
const sourceCode = context.getSourceCode();
const fix = getTypeFix(nodes, sourceCode, context);

const [first, ...rest] = nodes;
context.report({
node: first.source,
message,
fix, // Attach the autofix (if any) to the first import.
});

rest.forEach((node) => {
context.report({
node: node.source,
message,
});
});
}
}
});
}

function checkInlineTypeImports(imported, context) {
Array.from(imported).forEach(([module, nodes]) => {
if (nodes.length > 1) {
const message = `'${module}' imported multiple times.`;
const sourceCode = context.getSourceCode();
const fix = getInlineTypeFix(nodes, sourceCode);

const [first, ...rest] = nodes;
context.report({
node: first.source,
message,
fix, // Attach the autofix (if any) to the first import.
});

rest.forEach((node) => {
context.report({
node: node.source,
message,
});
});
}
});
}

function isComma(token) {
return token.type === 'Punctuator' && token.value === ',';
}

function getInlineTypeFix(nodes, sourceCode) {
return fixer => {
const fixes = [];

// push to first import
let [firstImport, ...rest] = nodes;
// const valueImport = nodes.find((n) => n.specifiers.every((spec) => spec.importKind === 'value')) || nodes.find((n) => n.specifiers.some((spec) => spec.type === 'ImportDefaultSpecifier'));
const valueImport = nodes.find((n) => n.specifiers.some((spec) => spec.type === 'ImportDefaultSpecifier'));
if (valueImport) {
firstImport = valueImport;
rest = nodes.filter((n) => n !== firstImport);
}

const nodeTokens = sourceCode.getTokens(firstImport);
// we are moving the rest of the Type or Inline Type imports here.
const nodeClosingBraceIndex = nodeTokens.findIndex(token => isPunctuator(token, '}'));
const nodeClosingBrace = nodeTokens[nodeClosingBraceIndex];
const tokenBeforeClosingBrace = nodeTokens[nodeClosingBraceIndex - 1];
if (nodeClosingBrace) {
const specifiers = [];
rest.forEach((node) => {
// these will be all Type imports, no Value specifiers
// then add inline type specifiers to importKind === 'type' import
node.specifiers.forEach((specifier) => {
if (specifier.importKind === 'type') {
specifiers.push(`type ${specifier.local.name}`);
} else {
specifiers.push(specifier.local.name);
}
});

fixes.push(fixer.remove(node));
});

if (isComma(tokenBeforeClosingBrace)) {
fixes.push(fixer.insertTextBefore(nodeClosingBrace, ` ${specifiers.join(', ')}`));
} else {
fixes.push(fixer.insertTextBefore(nodeClosingBrace, `, ${specifiers.join(', ')}`));
}
} else {
// we have a default import only
const defaultSpecifier = firstImport.specifiers.find((spec) => spec.type === 'ImportDefaultSpecifier');
const inlineTypeImports = [];
for (const node of rest) {
// these will be all Type imports, no Value specifiers
// then add inline type specifiers to importKind === 'type' import
for (const specifier of node.specifiers) {
if (specifier.importKind === 'type') {
inlineTypeImports.push(`type ${specifier.local.name}`);
} else {
inlineTypeImports.push(specifier.local.name);
}
}

fixes.push(fixer.remove(node));
}

fixes.push(fixer.insertTextAfter(defaultSpecifier, `, {${inlineTypeImports.join(', ')}}`));
}

return fixes;
};
}

function getTypeFix(nodes, sourceCode, context) {
return fixer => {
const fixes = [];

const preferInline = context.options[0] && context.options[0]['prefer-inline'];

if (preferInline) {
if (!semver.satisfies(typescriptPkg.version, '>= 4.5')) {
throw new Error('Your version of TypeScript does not support inline type imports.');
}

// collapse all type imports to the inline type import
const typeImports = nodes.filter((node) => node.importKind === 'type');
const someInlineTypeImports = nodes.filter((node) => node.specifiers.some((spec) => spec.importKind === 'type'));
// push to first import
const firstImport = someInlineTypeImports[0];

if (firstImport) {
const nodeTokens = sourceCode.getTokens(firstImport);
// we are moving the rest of the Type imports here
const nodeClosingBrace = nodeTokens.find(token => isPunctuator(token, '}'));

for (const node of typeImports) {
for (const specifier of node.specifiers) {
fixes.push(fixer.insertTextBefore(nodeClosingBrace, `, type ${specifier.local.name}`));
}

fixes.push(fixer.remove(node));
}
}
} else {
// move inline types to type imports
const typeImports = nodes.filter((node) => node.importKind === 'type');
const someInlineTypeImports = nodes.filter((node) => node.specifiers.some((spec) => spec.importKind === 'type'));

const firstImport = typeImports[0];

if (firstImport) {
const nodeTokens = sourceCode.getTokens(firstImport);
// we are moving the rest of the Type imports here
const nodeClosingBrace = nodeTokens.find(token => isPunctuator(token, '}'));

for (const node of someInlineTypeImports) {
for (const specifier of node.specifiers) {
if (specifier.importKind === 'type') {
fixes.push(fixer.insertTextBefore(nodeClosingBrace, `, ${specifier.local.name}`));
}
}

if (node.specifiers.every((spec) => spec.importKind === 'type')) {
fixes.push(fixer.remove(node));
} else {
for (const specifier of node.specifiers) {
if (specifier.importKind === 'type') {
const maybeComma = sourceCode.getTokenAfter(specifier);
if (isComma(maybeComma)) {
fixes.push(fixer.remove(maybeComma));
}
// TODO: remove `type`?
fixes.push(fixer.remove(specifier));
}
}
}
}
}
}

return fixes;
};
}

function getFix(first, rest, sourceCode) {
// Sorry ESLint <= 3 users, no autofix for you. Autofixing duplicate imports
// requires multiple `fixer.whatever()` calls in the `fix`: We both need to
// update the first one, and remove the rest. Support for multiple
Expand Down Expand Up @@ -115,22 +307,13 @@ function getFix(first, rest, sourceCode, context) {

const [specifiersText] = specifiers.reduce(
([result, needsComma, existingIdentifiers], specifier) => {
const isTypeSpecifier = specifier.importNode.importKind === 'type';

const preferInline = context.options[0] && context.options[0]['prefer-inline'];
// a user might set prefer-inline but not have a supporting TypeScript version. Flow does not support inline types so this should fail in that case as well.
if (preferInline && (!typescriptPkg || !semver.satisfies(typescriptPkg.version, '>= 4.5'))) {
throw new Error('Your version of TypeScript does not support inline type imports.');
}

// Add *only* the new identifiers that don't already exist, and track any new identifiers so we don't add them again in the next loop
const [specifierText, updatedExistingIdentifiers] = specifier.identifiers.reduce(([text, set], cur) => {
const trimmed = cur.trim(); // Trim whitespace before/after to compare to our set of existing identifiers
const curWithType = trimmed.length > 0 && preferInline && isTypeSpecifier ? `type ${cur}` : cur;
if (existingIdentifiers.has(trimmed)) {
return [text, set];
}
return [text.length > 0 ? `${text},${curWithType}` : curWithType, set.add(trimmed)];
return [text.length > 0 ? `${text},${cur}` : cur, set.add(trimmed)];
}, ['', existingIdentifiers]);

return [
Expand Down Expand Up @@ -169,7 +352,7 @@ function getFix(first, rest, sourceCode, context) {
// `import def from './foo'` → `import def, {...} from './foo'`
fixes.push(fixer.insertTextAfter(first.specifiers[0], `, {${specifiersText}}`));
}
} else if (!shouldAddDefault && openBrace != null && closeBrace != null) {
} else if (!shouldAddDefault && openBrace != null && closeBrace != null && specifiersText) {
// `import {...} './foo'` → `import {..., ...} from './foo'`
fixes.push(fixer.insertTextBefore(closeBrace, specifiersText));
}
Expand Down Expand Up @@ -314,15 +497,18 @@ module.exports = {
nsImported: new Map(),
defaultTypesImported: new Map(),
namedTypesImported: new Map(),
inlineTypesImported: new Map(),
});
}
const map = moduleMaps.get(n.parent);
const preferInline = context.options[0] && context.options[0]['prefer-inline'];
if (!preferInline && n.importKind === 'type') {
if (n.importKind === 'type') {
// import type Foo | import type { foo }
return n.specifiers.length > 0 && n.specifiers[0].type === 'ImportDefaultSpecifier' ? map.defaultTypesImported : map.namedTypesImported;
}
if (!preferInline && n.specifiers.some((spec) => spec.importKind === 'type')) {
return map.namedTypesImported;

if (n.specifiers.some((spec) => spec.importKind === 'type')) {
// import { type foo }
return map.inlineTypesImported;
}

return hasNamespace(n) ? map.nsImported : map.imported;
Expand All @@ -347,6 +533,26 @@ module.exports = {
checkImports(map.nsImported, context);
checkImports(map.defaultTypesImported, context);
checkImports(map.namedTypesImported, context);

const duplicatedImports = new Map(map.inlineTypesImported);
map.imported.forEach((value, key) => {
if (duplicatedImports.has(key)) {
duplicatedImports.get(key).push(...value);
} else {
duplicatedImports.set(key, [value]);
}
});
checkInlineTypeImports(duplicatedImports, context);

const duplicatedTypeImports = new Map(map.inlineTypesImported);
map.namedTypesImported.forEach((value, key) => {
if (duplicatedTypeImports.has(key)) {
duplicatedTypeImports.get(key).push(...value);
} else {
duplicatedTypeImports.set(key, value);
}
});
checkTypeImports(duplicatedTypeImports, context);
}
},
};
Expand Down
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