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import.mjs
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import.mjs
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'use strict';
// require.js
// Node.js only: adds a import() hook for .jsox files, just like the native
// hook for .jsox files. Also adds support for HTTP/HTTPS requested files.
//
// Usage:
// import {default as config} from "config.jsox";
import fs from "node:fs";
import url from "node:url";
import path from "node:path";
import util from "node:util";
import {sack} from "sack.vfs";
const debug_ = false;
const forceModule = ( process.env.FORCE_IMPORT_MODULE ) || false;
const forceHttpModule = ( process.env.FORCE_IMPORT_HTTP_MODULE ) || false;
/**
* @param {string} url
* @param {Object} context (currently empty)
* @param {Function} defaultGetFormat
* @returns {Promise<{ format: string }>}
*/
export async function getFormat(url, context, defaultGetFormat) {
const exten = path.extname( url );
//if( exten === '' ) return { format:'module' }
debug_ && console.log( "Format of:", url, context, defaultGetFormat );
if( exten === ".jsox" || exten === ".json6" ){
return { format: 'module' };
}
return defaultGetFormat(url,context );
}
/**
* @param {string} url
* @param {{ format: string }} context
* @param {Function} defaultGetSource
* @returns {Promise<{ source: !(string | SharedArrayBuffer | Uint8Array) }>}
*/
export async function getSource(urlin, context, defaultGetSource) {
const exten = path.extname( urlin );
if( exten === ".jsox" || exten === '.json6' ){
const { format } = context;
const file = url.fileURLToPath(urlin);
const result = fs.readFileSync(file).toString("utf8");
return {
source: result,
};
}
// Defer to Node.js for all other URLs.
return defaultGetSource(urlin, context, defaultGetSource);
}
/**
* @param {!(string | SharedArrayBuffer | Uint8Array)} source
* @param {{
* format: string,
* url: string,
* }} context
* @param {Function} defaultTransformSource
* @returns {Promise<{ source: !(string | SharedArrayBuffer | Uint8Array) }>}
*/
export async function transformSource(source, context, defaultTransformSource) {
const exten = path.extname( context.url );
if( exten === ".jsox" ){
return {
source: "const data = JSOX.parse( '" + escape(source) + "'); export default data;",
};
}
if( exten === ".json6" ){
return {
source: "const data = JSON6.parse( '" + escape(source) + "'); export default data;",
};
}
return defaultTransformSource(source, context, defaultTransformSource);
}
export async function load(urlin, context, defaultLoad) {
const { format } = context;
const exten = path.extname( urlin );
debug_&&console.log( "LOAD:", urlin, exten, context );
if( urlin.startsWith( "module://./" ) ) {
// this handles forcing load of a module (even if extension is .js)
// otherwise loading the file normally would work better.
// This is for pretending that the load happens as if it happened over the HTTP connection
// The rules for the HTTP loader would redirect /node_modules and /common to different locations than the resource path.
// environment variables that control this: COMMON_PATH for /common; NODE_MODULE_PATH for "/node_modules"; and RESOURCE_PATH for everything else
context.format="module";
let pathOnly = urlin.substring( 10 );
debug_ && console.log( "pathOnly:", pathOnly, urlin )
if( pathOnly.startsWith( "/common" ) ) pathOnly = pathOnly.replace( "/common", process.env.COMMON_PATH ) ?? "../..";
else if( pathOnly.startsWith( "/node_modules" ) ) pathOnly = pathOnly.replace( "/node_modules", process.env.NODE_MODULE_PATH ) ?? "../../node_modules";
else pathOnly = ( process.env.RESOURCE_PATH??".") + pathOnly;
urlin = url.pathToFileURL( pathOnly ).href;
debug_ && console.log( "Resulting urlin:", urlin );
} else if( urlin.startsWith( "http://" ) || urlin.startsWith( "https://" ) || urlin.startsWith( "HTTP://" ) || urlin.startsWith( "HTTPS://" ) ) {
const url = new URL( urlin );
const exten = path.extname( url.pathname );
debug_&&console.log( "Real extension:", exten );
url.has = "";
url.search = "";
return new Promise( (res,rej)=>{
const request = { hostname:url.hostname, path:url.pathname, port:Number(url.port), onReply(result){
if( result.statusCode === 200 ) {
debug_ && console.log( "Got back success...", !forceModule, !forceHttpModule, ( !forceModule && !forceHttpModule && exten===".js" )?"commonjs":"module", result.content.substr(0, 40) )
res( {
format:( !forceModule && !forceHttpModule && exten===".js" )?"commonjs":"module",
source:result.content,
shortCircuit:true,
} );
} else {
rej(util.format( "request for (", urlin, ") failed:", result ) );
//sack.log( );
}
} };
sack.HTTP.get( request );
})
}
else if( exten === ".jsox" || exten === '.json6' ){
const { format } = context;
debug_&&console.log( "urlin is a string?", typeof urlin );
const file = url.fileURLToPath(urlin);
debug_&&console.log( "FILE?:", urlin, file )
const result = fs.readFileSync(file).toString("utf8");
if( exten === ".jsox" ){
return {
format:"module",
source: "import {sack} from 'sack.vfs'; const data = sack.JSOX.parse( '" + escape(result) + "'); export default data;",
shortCircuit:true,
};
}
if( exten === ".json6" ){
return {
format:"module",
source: "import {sack} from 'sack.vfs'; const data = sack.JSON6.parse( '" + escape(result) + "'); export default data;",
shortCircuit:true,
};
}
} else {
debug_ && console.log( "forcing .js to be module?", process.env.FORCE_IMPORT_MODULE, forceModule, exten );
if( forceModule && exten === ".js" ) context.format="module";
}
return defaultLoad(urlin, context, defaultLoad);
}
function escape(string) {
let output = '';
if( !string ) return string;
for( let n = 0; n < string.length; n++ ) {
const ch = string[n];
if( ch === '\n' ){
output += "\\n";
} else if( ch === '\r' ){
output += "\\r";
} else {
if( ( ch === '"' ) || ( ch === '\\' ) || ( ch === '`' )|| ( ch === '\'' )) {
output += '\\';
}
output += ch;
}
}
return output;
};
/**
* @returns {string} Code to run before application startup
*/
// Preloads JSON6 as a global resource; which is then used in the transformed source above.
export function globalPreload() {
// this changes in 17+; check node version from process? and export the right thing?
return getGlobalPreloadCode();
}
export function getGlobalPreloadCode() {
return `\
const { createRequire } = getBuiltin('module');
const requireJSOX = createRequire('${escape(url.fileURLToPath( import.meta.url ))}');
globalThis.SACK = requireJSOX( "sack.vfs" );
globalThis.JSOX = globalThis.SACK.JSOX;
globalThis.JSON6 = globalThis.SACK.JSON6;
`;
}
export function initialize( data ) {
//console.log( "Got:", data );
}
export function resolve( specifier, context, nextResolve ) {
debug_ && console.log( "resolve continue?", specifier, context );
if( specifier.startsWith( "http:" ) || specifier.startsWith( "https:" ) || specifier.startsWith( "module:" ) ) {
return {
shortCircuit: true,
url: context.parentURL ?
new URL(specifier, context.parentURL).href :
new URL(specifier).href,
};
return {
shortCircuit: true,
url: parentURL ?
new URL(specifier, context.parentURL).href :
new URL(specifier).href,
};
} else if( specifier.endsWith( ".jsox" ) ){
return {
shortCircuit: true,
url: context.parentURL ?
new URL(specifier, context.parentURL).href :
new URL(specifier).href,
};
} else if( specifier.endsWith( ".json6" ) ){
return {
shortCircuit: true,
url: context.parentURL ?
new URL(specifier, context.parentURL).href :
new URL(specifier).href,
};
}
if( forceModule ) {
console.log( "Return forced module:" );
return nextResolve( specifier, {
format: "module"
} );
}
// nextResolve( specifier, {modified options} );
return nextResolve( specifier, context );
}
import module from "node:module";
const version = process.version.slice(1).split('.' ).map( a=>Number(a));
if( version[0] >= 21 || ( version[0] >= 20 && version[1] >= 6 ) ) {
// https://nodejs.org/api/module.html#resolvespecifier-context-nextresolve
const fileURL = url.pathToFileURL("./", import.meta.url );
debug_ && console.log( "FileURL?", fileURL );
//module.register( "sack.vfs/import.mjs", fileURL );
module.register( "sack.vfs/import.mjs", fileURL.href );
}
/*
{
parentURL: import.meta.url,
data: { number: 1, port: port2 },
transferList: [port2],
}
*/
// --import 'data:text/javascript,import { register } from "node:module"; import { pathToFileURL } from "node:url"; register("sack.vfs/import.mjs", pathToFileURL("./"));'
//--import "sack.vfs/import"