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feat: initial CommonJS module support
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gabriel.rohden
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Dec 18, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| const fs = require("fs"); | ||
|
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| const ts = require("typescript"); | ||
|
|
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| const isObjectDefineProperty = (child) => { | ||
| return child.kind === ts.SyntaxKind.ExpressionStatement | ||
| && child.expression.kind === ts.SyntaxKind.CallExpression | ||
| && child.expression.expression.kind === ts.SyntaxKind.PropertyAccessExpression | ||
| && child.expression.expression.name.text === "defineProperty"; | ||
| }; | ||
|
|
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| const findReturnStatement = (child) => { | ||
| return child.initializer.body.statements.find(statement => ts.SyntaxKind.ReturnStatement === statement.kind); | ||
| }; | ||
|
|
||
| /** | ||
| * Given a call expression returns the require call expression either from | ||
| * direct require call or from wrapped _interopRequireDefault call | ||
| * | ||
| * eg: | ||
| * require("./buzz"); // returns require("./buzz") | ||
| * _interopRequireDefault(require("./buzz")); // returns require("./buzz") | ||
| * | ||
| * if its not a require call, returns null | ||
| */ | ||
| const getRequireCallData = (child) => { | ||
| if (child.kind === ts.SyntaxKind.CallExpression) { | ||
| const callExpression = child.expression; | ||
|
|
||
| if (callExpression.kind === ts.SyntaxKind.Identifier) { | ||
| if (callExpression.text === "_interopRequireDefault") { | ||
| return getRequireCallData(child.arguments[0]); | ||
| } | ||
|
|
||
| if (callExpression.text === "require") { | ||
| return child; | ||
| } | ||
| } | ||
| } | ||
|
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||
| return null; | ||
| }; | ||
|
|
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| /** | ||
| * Given an child node, checks if it | ||
| * is a require variable statement like | ||
| * | ||
| * var _foo = require('foo'); | ||
| * | ||
| * and if it is, returns the require value and the variable name | ||
| * else returns null | ||
| */ | ||
| const getRequireVariableStatementData = (child) => { | ||
| if ( | ||
| !child.kind === ts.SyntaxKind.VariableStatement && child.expression.kind === ts.SyntaxKind.VariableDeclarationList | ||
| ) { | ||
| return null; | ||
| } | ||
|
|
||
| const [declaration] = child.declarationList?.declarations || []; | ||
| if (declaration?.kind !== ts.SyntaxKind.VariableDeclaration) { | ||
| return null; | ||
| } | ||
|
|
||
| const callData = getRequireCallData(declaration.initializer); | ||
| if (!callData) { | ||
| return null; | ||
| } | ||
|
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| return { | ||
| name: declaration.name.text, | ||
| value: callData.arguments[0].text, | ||
| }; | ||
| }; | ||
|
|
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| /** | ||
| * Parses a CJS barrel (index) file, extracts all it's export | ||
| * names and returns an object that maps | ||
| * a import name to the path + some meta infos. | ||
| * | ||
| * Note: this doesn't handle dynamic imports. | ||
| */ | ||
| const collectCjsExports = (file) => { | ||
| const sourceFile = ts.createSourceFile( | ||
| file, | ||
| fs.readFileSync(file).toString(), | ||
| ts.ScriptTarget.ES2015, | ||
| true, | ||
| ); | ||
|
|
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| const definePropsResolvers = {}; | ||
| const requireResolvers = {}; | ||
|
|
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| sourceFile.forEachChild((child) => { | ||
| // collects cjs exports | ||
| if (isObjectDefineProperty(child)) { | ||
| const [exportsTarget, accessorName, definition] = child.expression.arguments; | ||
|
|
||
| if (exportsTarget.text !== "exports") { | ||
| return; | ||
| } | ||
|
|
||
| if (accessorName.text === "__esModule") { | ||
| // Should we validate that the value is true? | ||
| return; | ||
| } | ||
|
|
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| const [, value] = definition.properties; | ||
|
|
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| if (value.name.text === "get") { | ||
| const returnStatement = findReturnStatement(value).expression; | ||
|
|
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| definePropsResolvers[accessorName.text] = { | ||
| variableName: returnStatement.expression.text, | ||
| accessor: returnStatement.name.text, | ||
| }; | ||
| } | ||
| } | ||
|
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| const requireData = getRequireVariableStatementData(child); | ||
| if (requireData) { | ||
| requireResolvers[requireData.name] = requireData.value; | ||
| } | ||
| }); | ||
|
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| return Object.entries(definePropsResolvers).reduce((acc, [importName, data]) => { | ||
| acc[importName] = { | ||
| importPath: requireResolvers[data.variableName], | ||
| importAlias: data.accessor === importName ? null : data.accessor, | ||
| }; | ||
|
|
||
| return acc; | ||
| }, {}); | ||
| }; | ||
|
|
||
| module.exports = { collectCjsExports }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| const DEBUG = 1; | ||
| const INFO = 2; | ||
|
|
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| function resolveLogLevel(level) { | ||
| switch (level) { | ||
| case "debug": | ||
| return DEBUG; | ||
| case "info": | ||
| return INFO; | ||
| default: | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| module.exports = { | ||
| DEBUG, | ||
| INFO, | ||
| resolveLogLevel, | ||
| }; |
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