separate_snapshots.js

const { promises: fsp } = require("fs");

async function main(name) {
  const content = await fsp.readFile(`./${name}.test.ts.snap`, "utf8");
  const lines = content.split("\n");
  const results = {};
  let header = "";
  for (let lineNumber = 0; lineNumber < lines.length; lineNumber++) {
    const line = lines[lineNumber];
    if (line.startsWith("//")) {
      header += line + "\n";
    } else if (line.trim() === "") {
      // ignore
    } else if (line.startsWith("exports[`")) {
      const matches = line.match(
        /^exports\[`([a-zA-Z0-9._-]+?)\.graphql 1`\] = `/,
      );
      if (!matches) {
        throw new Error(
          `Could not process exports line ${lineNumber}: ${line}`,
        );
      }
      const [_, key] = matches;
      const finish = lines.findIndex(
        (endLine, index) => index >= lineNumber && endLine.startsWith("`;"),
      );
      if (finish > lineNumber) {
        results[key] =
          "`\n" + lines.slice(lineNumber + 1, finish + 1).join("\n");
        lineNumber = finish;
      } else {
        throw new Error(
          `Failed to find terminal for line ${lineNumber}: ${line}`,
        );
      }
    } else {
      throw new Error(`Failed to process line ${lineNumber}: ${line}`);
    }
  }
  for (const key in results) {
    try {
      await fsp.mkdir(`../${name}`);
    } catch (e) {
      // Noop
    }
    try {
      await fsp.mkdir(`../${name}/__snapshots__`);
    } catch (e) {
      // Noop
    }
    await fsp.writeFile(
      `../${name}/__snapshots__/${key}.test.graphql.snap`,
      `\
${header}
exports[\`execute 1\`] = ${results[key]}
`,
    );
  }
}

main("mutations").catch((e) => {
  console.error(e);
  process.exit(1);
});