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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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