Programmatic SEA blob generation API

Currently, CLI commands and many files are involved in generating a SEA using Javascript.

For example:

import { execSync } from 'node:child_process';
import { copyFileSync, readFileSync, writeFileSync } from 'node:fs';
import { inject } from 'postject';

const blobPath = 'path/to/sea.blob',
	configPath = 'path/to/sea.json',
	outputPath = 'path/to/executable';

writeFileSync(
	configPath,
	JSON.stringify({
		main: 'path/to/main.js',
		output: blobPath,
		disableExperimentalSEAWarning: true,
	})
);
execSync('node --experimental-sea-config ' + configPath, { stdio: 'inherit' });
copyFileSync(process.execPath, outputPath);
await inject(outputPath, 'NODE_SEA_BLOB', readFileSync(blobPath), {
	machoSegmentName: 'NODE_SEA',
	sentinelFuse: 'NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2',
});

It would be nice if Node.js provided a Javascript API for generating SEA blobs. This would eliminate extra file creation and streamline the SEA creation process. I propose adding a function to the node:sea module/API (Typescript used for clarity):

/**
 * Configuration options for generating a SEA blob
 * @see https://nodejs.org/api/single-executable-applications.html#generating-single-executable-preparation-blobs
 */
interface BlobConfiguration {
	main: string;
	disableExperimentalSEAWarning?: boolean;
	useSnapshot?: boolean;
	useCodeCache?: boolean;
	assets?: Record<string, string>;
}

/**
 * Generates a SEA blob to be injected into an executable
 * @param config configuration options for the blob
 * @returns The blob contents in a buffer
 */
function generateBlob(config: BlobConfiguration): Buffer;

This new function in the SEA API would allow for more streamlined and readable code:

import { copyFileSync } from 'node:fs';
import { generateBlob } from 'node:sea';
import { inject } from 'postject';

const outputPath = 'path/to/executable';

const blob = generateBlob({
	main: 'path/to/main.js',
	disableExperimentalSEAWarning: true,
});
copyFileSync(process.execPath, outputPath);
await inject(outputPath, 'NODE_SEA_BLOB', blob, {
	machoSegmentName: 'NODE_SEA',
	sentinelFuse: 'NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2',
});

Which could even be inlined:

import { copyFileSync } from 'node:fs';
import { generateBlob } from 'node:sea';
import { inject } from 'postject';

const outputPath = 'path/to/executable';

copyFileSync(process.execPath, outputPath);
await inject(
	outputPath,
	'NODE_SEA_BLOB',
	generateBlob({
		main: 'path/to/main.js',
		disableExperimentalSEAWarning: true,
	}),
	{
		machoSegmentName: 'NODE_SEA',
		sentinelFuse: 'NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2',
	}
);

Discussion
Issue on nodejs/single-executable

Bắt đầu với API node:sea hiện có và luồng tạo --experimental-sea-config được mô tả trong issue, sau đó lần theo cách CLI tạo các blob SEA. Công việc được xem là hoàn tất khi một API JavaScript có thể tạo nội dung blob tương đương từ cấu hình được đề xuất mà không tạo các tệp cấu hình và blob tạm thời.