/
generate-imports.js
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/
generate-imports.js
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import { dirname, resolve } from 'path';
import { sync as nodeResolveSync } from 'resolve';
import {
DYNAMIC_MODULES_ID,
EXPORTS_SUFFIX,
HELPERS_ID,
IS_WRAPPED_COMMONJS,
MODULE_SUFFIX,
wrapId
} from './helpers';
import { normalizePathSlashes } from './utils';
export function isRequireStatement(node, scope) {
if (!node) return false;
if (node.type !== 'CallExpression') return false;
// Weird case of `require()` or `module.require()` without arguments
if (node.arguments.length === 0) return false;
return isRequire(node.callee, scope);
}
function isRequire(node, scope) {
return (
(node.type === 'Identifier' && node.name === 'require' && !scope.contains('require')) ||
(node.type === 'MemberExpression' && isModuleRequire(node, scope))
);
}
export function isModuleRequire({ object, property }, scope) {
return (
object.type === 'Identifier' &&
object.name === 'module' &&
property.type === 'Identifier' &&
property.name === 'require' &&
!scope.contains('module')
);
}
export function isStaticRequireStatement(node, scope) {
if (!isRequireStatement(node, scope)) return false;
return !hasDynamicArguments(node);
}
function hasDynamicArguments(node) {
return (
node.arguments.length > 1 ||
(node.arguments[0].type !== 'Literal' &&
(node.arguments[0].type !== 'TemplateLiteral' || node.arguments[0].expressions.length > 0))
);
}
const reservedMethod = { resolve: true, cache: true, main: true };
export function isNodeRequirePropertyAccess(parent) {
return parent && parent.property && reservedMethod[parent.property.name];
}
export function isIgnoredRequireStatement(requiredNode, ignoreRequire) {
return ignoreRequire(requiredNode.arguments[0].value);
}
export function getRequireStringArg(node) {
return node.arguments[0].type === 'Literal'
? node.arguments[0].value
: node.arguments[0].quasis[0].value.cooked;
}
export function hasDynamicModuleForPath(source, id, dynamicRequireModules) {
if (!/^(?:\.{0,2}[/\\]|[A-Za-z]:[/\\])/.test(source)) {
try {
const resolvedPath = normalizePathSlashes(nodeResolveSync(source, { basedir: dirname(id) }));
if (dynamicRequireModules.has(resolvedPath)) {
return true;
}
} catch (ex) {
// Probably a node.js internal module
return false;
}
return false;
}
for (const attemptExt of ['', '.js', '.json']) {
const resolvedPath = normalizePathSlashes(resolve(dirname(id), source + attemptExt));
if (dynamicRequireModules.has(resolvedPath)) {
return true;
}
}
return false;
}
export function getRequireHandlers() {
const requireExpressions = [];
function addRequireStatement(sourceId, node, scope, usesReturnValue, toBeRemoved) {
requireExpressions.push({ sourceId, node, scope, usesReturnValue, toBeRemoved });
}
async function rewriteRequireExpressionsAndGetImportBlock(
magicString,
topLevelDeclarations,
topLevelRequireDeclarators,
reassignedNames,
helpersName,
dynamicRequireName,
moduleName,
exportsName,
id,
exportMode,
resolveRequireSourcesAndGetMeta,
needsRequireWrapper,
isEsModule,
usesRequire
) {
const imports = [];
imports.push(`import * as ${helpersName} from "${HELPERS_ID}";`);
if (usesRequire) {
imports.push(
`import { commonjsRequire as ${dynamicRequireName} } from "${DYNAMIC_MODULES_ID}";`
);
}
if (exportMode === 'module') {
imports.push(
`import { __module as ${moduleName}, exports as ${exportsName} } from ${JSON.stringify(
wrapId(id, MODULE_SUFFIX)
)}`
);
} else if (exportMode === 'exports') {
imports.push(
`import { __exports as ${exportsName} } from ${JSON.stringify(wrapId(id, EXPORTS_SUFFIX))}`
);
}
const requiresBySource = collectSources(requireExpressions);
const { requireTargets, usesRequireWrapper } = await resolveRequireSourcesAndGetMeta(
id,
needsRequireWrapper ? IS_WRAPPED_COMMONJS : !isEsModule,
Object.keys(requiresBySource)
);
processRequireExpressions(imports, requireTargets, requiresBySource, magicString);
return {
importBlock: imports.length ? `${imports.join('\n')}\n\n` : '',
usesRequireWrapper
};
}
return {
addRequireStatement,
rewriteRequireExpressionsAndGetImportBlock
};
}
function collectSources(requireExpressions) {
const requiresBySource = Object.create(null);
for (const { sourceId, node, scope, usesReturnValue, toBeRemoved } of requireExpressions) {
if (!requiresBySource[sourceId]) {
requiresBySource[sourceId] = [];
}
const requires = requiresBySource[sourceId];
requires.push({ node, scope, usesReturnValue, toBeRemoved });
}
return requiresBySource;
}
function processRequireExpressions(imports, requireTargets, requiresBySource, magicString) {
const generateRequireName = getGenerateRequireName();
for (const { source, id: resolveId, isCommonJS } of requireTargets) {
const requires = requiresBySource[source];
const name = generateRequireName(requires);
if (isCommonJS === IS_WRAPPED_COMMONJS) {
for (const { node } of requires) {
magicString.overwrite(node.start, node.end, `${name}()`);
}
imports.push(`import { __require as ${name} } from ${JSON.stringify(resolveId)};`);
} else {
let usesRequired = false;
for (const { node, usesReturnValue, toBeRemoved } of requires) {
if (usesReturnValue) {
usesRequired = true;
magicString.overwrite(node.start, node.end, name);
} else {
magicString.remove(toBeRemoved.start, toBeRemoved.end);
}
}
imports.push(`import ${usesRequired ? `${name} from ` : ''}${JSON.stringify(resolveId)};`);
}
}
}
function getGenerateRequireName() {
let uid = 0;
return (requires) => {
let name;
const hasNameConflict = ({ scope }) => scope.contains(name);
do {
name = `require$$${uid}`;
uid += 1;
} while (requires.some(hasNameConflict));
return name;
};
}