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Generating typescript definitions from .graphql files using apollo-codegen and graphql-code-generator
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| const { introspectSchema } = require("apollo-codegen"); | |
| const { executeWithOptions } = require("graphql-code-generator/dist/cli"); | |
| const fs = require("fs"); | |
| const path = require("path"); | |
| const graphqlPath = "./src/graphql/"; | |
| const schemaInput = "./src/graphql/temp.graphql"; | |
| const jsonOutput = "./src/graphql/temp.json"; | |
| const dtsOutput = "./src/graphql/domain.d.ts"; | |
| function regen() { | |
| cleanTempFiles(); | |
| combineSchema(schemaInput); | |
| introspectSchema(schemaInput, jsonOutput) | |
| .then(async () => { | |
| const dts = await executeWithOptions({ | |
| file: jsonOutput, | |
| out: dtsOutput, | |
| template: "typescript", | |
| schema: true | |
| }); | |
| fs.writeFileSync(dts[0].filename, dts[0].content); | |
| }) | |
| .catch(err => { | |
| console.log(err); | |
| }) | |
| .then(() => { | |
| cleanTempFiles(); | |
| }); | |
| } | |
| function cleanTempFiles() { | |
| if (fs.existsSync(schemaInput)) { | |
| fs.unlinkSync(schemaInput); | |
| } | |
| if (fs.existsSync(jsonOutput)) { | |
| fs.unlinkSync(jsonOutput); | |
| } | |
| } | |
| function combineSchema(outputFilename) { | |
| const files = fs.readdirSync(graphqlPath); | |
| const schemas = files.filter(f => f.endsWith(".graphql")); | |
| const outputFile = fs.openSync(outputFilename, "ax"); | |
| schemas.forEach(s => | |
| fs.appendFileSync(outputFile, fs.readFileSync(path.resolve(graphqlPath, s))) | |
| ); | |
| fs.closeSync(outputFile); | |
| } | |
| regen(); |
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