change writeHash to use a default parameter instead of bind (#17)

[kinland]

This PR allows you to write a custom hash. This is primarily a workaround for #16

With these changes, I can now do something like

/** @type {import('package-changed/types')} */
const { isPackageChanged } = require('package-changed');

/** @type {import('child_process')} */
const { execSync } = require('node:child_process');

(async () => {
    const { oldHash, hash: rootHash, writeHash } = await isPackageChanged({ noHashFile: true });
    const { hash: nextjsHash } = await isPackageChanged({ noHashFile: true, cwd: './nextjs' });

    const newHash = `${rootHash}${nextjsHash}`;

    if (newHash !== oldHash) {
        console.log("Package changed. Running 'rm -f .eslintcache && pnpm install'.");
        // dependencies in a package.json have changed since last run
        execSync('rm -f .eslintcache');
        execSync('pnpm install');

        writeHash(newHash);
    }
})();

[thdk]

Hi, thanks for your effort. I like your approach as it keeps the library simple without requiring too much knowledge of package managers logic.

However, I think we can add a helper function to the library writeHash(hash: string): void which could also be used internally when calling the writeHash(): void function returned from isPackageChanged.

So your example usage would become:

/** @type {import('package-changed/types')} */
const { isPackageChanged, writeHash } = require('package-changed');

/** @type {import('child_process')} */
const { execSync } = require('node:child_process');

(async () => {
    const { oldHash, hash: rootHash } = await isPackageChanged({ noHashFile: true });
    const { hash: nextjsHash } = await isPackageChanged({ noHashFile: true, cwd: './nextjs' });

    const newHash = `${rootHash}${nextjsHash}`;

    if (newHash !== oldHash) {
        console.log("Package changed. Running 'rm -f .eslintcache && pnpm install'.");
        // dependencies in a package.json have changed since last run
        execSync('rm -f .eslintcache');
        execSync('pnpm install');

        writeHash(newHash);
    }
})();