import * as fs from 'node:fs'; import { fileURLToPath } from 'node:url'; import { dirname } from 'node:path'; import * as yaml from 'js-yaml'; import ts from 'typescript'; const __filename = fileURLToPath(import.meta.url); const __dirname = dirname(__filename); // braces preceded by backslashes are literal, they don't represent // parameters; they get cleaned up by `locales/index.js` before // getting shipped to the browser const parameterRegExp = /(? parameter, ); return parameters.length ? ts.factory.createTypeReferenceNode( ts.factory.createIdentifier('ParameterizedString'), [ ts.factory.createUnionTypeNode( parameters.map((parameter) => ts.factory.createStringLiteral(parameter), ), ), ], ) : ts.factory.createKeywordTypeNode(ts.SyntaxKind.StringKeyword); } function createMembers(record) { return Object.entries(record).map(([k, v]) => { const node = ts.factory.createPropertySignature( undefined, ts.factory.createStringLiteral(k), undefined, createMemberType(v), ); if (typeof v === 'string') { ts.addSyntheticLeadingComment( node, ts.SyntaxKind.MultiLineCommentTrivia, `* * ${v.replace(/\n/g, '\n * ')} `, true, ); } return node; }); } export default function generateDTS() { const locale = yaml.load(fs.readFileSync(`${__dirname}/ja-JP.yml`, 'utf-8')); const members = createMembers(locale); const elements = [ ts.factory.createVariableStatement( [ts.factory.createToken(ts.SyntaxKind.DeclareKeyword)], ts.factory.createVariableDeclarationList( [ ts.factory.createVariableDeclaration( ts.factory.createIdentifier('kParameters'), undefined, ts.factory.createTypeOperatorNode( ts.SyntaxKind.UniqueKeyword, ts.factory.createKeywordTypeNode(ts.SyntaxKind.SymbolKeyword), ), undefined, ), ], ts.NodeFlags.Const, ), ), ts.factory.createInterfaceDeclaration( [ts.factory.createToken(ts.SyntaxKind.ExportKeyword)], ts.factory.createIdentifier('ParameterizedString'), [ ts.factory.createTypeParameterDeclaration( undefined, ts.factory.createIdentifier('T'), ts.factory.createKeywordTypeNode(ts.SyntaxKind.StringKeyword), ts.factory.createKeywordTypeNode(ts.SyntaxKind.StringKeyword), ), ], undefined, [ ts.factory.createPropertySignature( undefined, ts.factory.createComputedPropertyName( ts.factory.createIdentifier('kParameters'), ), undefined, ts.factory.createTypeReferenceNode( ts.factory.createIdentifier('T'), undefined, ), ), ], ), ts.factory.createInterfaceDeclaration( [ts.factory.createToken(ts.SyntaxKind.ExportKeyword)], ts.factory.createIdentifier('ILocale'), undefined, undefined, [ ts.factory.createIndexSignature( undefined, [ ts.factory.createParameterDeclaration( undefined, undefined, ts.factory.createIdentifier('_'), undefined, ts.factory.createKeywordTypeNode(ts.SyntaxKind.StringKeyword), undefined, ), ], ts.factory.createUnionTypeNode([ ts.factory.createKeywordTypeNode(ts.SyntaxKind.StringKeyword), ts.factory.createTypeReferenceNode( ts.factory.createIdentifier('ParameterizedString'), ), ts.factory.createTypeReferenceNode( ts.factory.createIdentifier('ILocale'), undefined, ), ]), ), ], ), ts.factory.createInterfaceDeclaration( [ts.factory.createToken(ts.SyntaxKind.ExportKeyword)], ts.factory.createIdentifier('Locale'), undefined, [ ts.factory.createHeritageClause(ts.SyntaxKind.ExtendsKeyword, [ ts.factory.createExpressionWithTypeArguments( ts.factory.createIdentifier('ILocale'), undefined, ), ]), ], members, ), ts.factory.createVariableStatement( [ts.factory.createToken(ts.SyntaxKind.DeclareKeyword)], ts.factory.createVariableDeclarationList( [ ts.factory.createVariableDeclaration( ts.factory.createIdentifier('locales'), undefined, ts.factory.createTypeLiteralNode([ ts.factory.createIndexSignature( undefined, [ ts.factory.createParameterDeclaration( undefined, undefined, ts.factory.createIdentifier('lang'), undefined, ts.factory.createKeywordTypeNode( ts.SyntaxKind.StringKeyword, ), undefined, ), ], ts.factory.createTypeReferenceNode( ts.factory.createIdentifier('Locale'), undefined, ), ), ]), undefined, ), ], ts.NodeFlags.Const, ), ), ts.factory.createFunctionDeclaration( [ts.factory.createModifier(ts.SyntaxKind.ExportKeyword)], undefined, ts.factory.createIdentifier('build'), undefined, [], ts.factory.createTypeReferenceNode( ts.factory.createIdentifier('Locale'), undefined, ), undefined, ), ts.factory.createExportDefault(ts.factory.createIdentifier('locales')), ]; ts.addSyntheticLeadingComment( elements[0], ts.SyntaxKind.MultiLineCommentTrivia, ' eslint-disable ', true, ); ts.addSyntheticLeadingComment( elements[0], ts.SyntaxKind.SingleLineCommentTrivia, ' This file is generated by locales/generateDTS.js', true, ); ts.addSyntheticLeadingComment( elements[0], ts.SyntaxKind.SingleLineCommentTrivia, ' Do not edit this file directly.', true, ); const printed = ts .createPrinter({ newLine: ts.NewLineKind.LineFeed, }) .printList( ts.ListFormat.MultiLine, ts.factory.createNodeArray(elements), ts.createSourceFile( 'index.d.ts', '', ts.ScriptTarget.ESNext, true, ts.ScriptKind.TS, ), ); fs.writeFileSync(`${__dirname}/index.d.ts`, printed, 'utf-8'); }