@@ -87,9 +87,23 @@ class Main {
8787 } else {
8888 this . #_config. addExtensions = false ;
8989 }
90+
91+ if ( 'aliases' in this . #_configFile) {
92+ const aliases = this . #_configFile. aliases ;
93+ if ( ! utils . is . realObject ( aliases ) ) { throw new Error ( `The "aliases" option is expecting a real object, isntead got ${ typeof aliases } ) }
94+
95+ this . #_config. aliases = { }
96+ for ( const prop in aliases ) {
97+ if ( typeof aliases [ prop ] === 'string' ) {
98+ this . #_config. aliases [ prop ] = aliases [ prop ] ;
99+ } else {
100+ throw new TypeError ( `One of the defined aliases (${ aliases [ prop ] } )
101+ }
102+ }
103+ }
90104 } catch ( error ) {
91105 if ( error instanceof Error ) {
92- error . message = `Unable to read postbuild.this.#_configFile.json : ${ error . message } ;
106+ error . message = `Unable to read postbuild configFile : ${ error . message } ;
93107 }
94108
95109 throw error ;
@@ -263,6 +277,98 @@ class Main {
263277 fs . writeFileSync ( fullPath , content , 'utf8' ) ;
264278 }
265279 } ) ;
280+ } ,
281+ aliases : {
282+ regex : {
283+ /**
284+ * Create a regular expression for catching imports
285+ * @param {string } pattern
286+ * @returns {RegExp }
287+ */
288+ createCatch : ( pattern ) => {
289+ const escapedPattern = pattern . replace ( / [ - \/ \\ ^ $ + ? . ( ) | [ \] { } ] / g, '\\$&' ) . replace ( / \* / g, '.*' ) ;
290+ return new RegExp ( `^${ escapedPattern } )
291+ } ,
292+ /**
293+ * Create a regular expression for catching imports
294+ * @param {string } pattern
295+ * @returns {RegExp }
296+ */
297+ createExact : ( pattern ) => {
298+ const escapedPattern = pattern . replace ( / [ - \/ \\ ^ $ + ? . ( ) | [ \] { } ] / g, '\\$&' ) ;
299+ return new RegExp ( `^${ escapedPattern } )
300+ }
301+ } ,
302+ getPatterns : ( ) => {
303+ const aliases = this . #_config. aliases ;
304+ return Object . keys ( aliases ) . map ( alias => {
305+ const catchPattern = this . #_helpers. aliases . regex . createCatch ( alias ) ;
306+ const exactPattern = this . #_helpers. aliases . regex . createExact ( alias ) ;
307+
308+ return {
309+ alias,
310+ catchPattern,
311+ exactPattern,
312+ resolvedPath : aliases [ alias ]
313+ } ;
314+ } ) ;
315+ } ,
316+ matchImportPath : ( importPath , aliasPatterns ) => {
317+ for ( const { catchPattern, exactPattern, resolvedPath } of aliasPatterns ) {
318+ // Check if the import path starts with the alias pattern
319+ const match = importPath . match ( catchPattern ) ;
320+ if ( match ) {
321+ const newMatch = match [ 0 ] . replace ( exactPattern , resolvedPath )
322+ const newImportPath = importPath . replace ( match [ 0 ] , newMatch ) ;
323+
324+ // Construct the new path by combining the resolved path with the remaining path
325+ return importPath . replace ( match , newImportPath )
326+ }
327+ }
328+
329+ return importPath ; // No match found
330+ } ,
331+ replaceImports : ( filePath , aliasPatterns ) => {
332+ let fileContent = fs . readFileSync ( filePath , 'utf8' ) ;
333+
334+ // Replace import paths based on alias patterns
335+ fileContent = fileContent . replace ( / f r o m [ ' " ] ( [ ^ ' " ] + ) [ ' " ] / g, ( match , importPath ) => {
336+ // Match the import path against alias patterns
337+ const resolvedPath = this . #_helpers. aliases . matchImportPath ( importPath , aliasPatterns ) ;
338+
339+ // Only replace if the alias was matched, else return the original import path
340+ if ( resolvedPath !== importPath ) {
341+ // Preserve the specific path segments after the alias
342+ const remainingPath = importPath . replace ( / ^ .* \/ [ ^ \/ ] + / , '' ) ; // Strip alias part
343+ return `from '${ resolvedPath } ${ remainingPath } ${ remainingPath . endsWith ( '.js' ) ? '' : '.js' } ;
344+ }
345+
346+ return match ; // No change if alias was not matched
347+ } ) ;
348+
349+ fs . writeFileSync ( filePath , fileContent , 'utf8' ) ;
350+ } ,
351+ processFiles : ( directory , aliasPatterns ) => {
352+ fs . readdirSync ( directory ) . forEach ( file => {
353+ const fullPath = path . join ( directory , file ) ;
354+
355+ if ( fs . lstatSync ( fullPath ) . isDirectory ( ) ) {
356+ this . #_helpers. aliases . processFiles ( fullPath , aliasPatterns ) ;
357+ } else if ( file . endsWith ( '.js' ) ) {
358+ this . #_helpers. aliases . replaceImports ( fullPath , aliasPatterns ) ;
359+ }
360+ } ) ;
361+ } ,
362+ check : ( ) => {
363+ const aliasPatterns = this . #_helpers. aliases . getPatterns ( ) ;
364+ if ( this . #_config. esmDir ) {
365+ this . #_helpers. aliases . processFiles ( this . #_config. esmDir , aliasPatterns ) ;
366+ }
367+
368+ if ( this . #_config. cjsDir ) {
369+ this . #_helpers. aliases . processFiles ( this . #_config. cjsDir , aliasPatterns ) ;
370+ }
371+ }
266372 }
267373 }
268374
@@ -274,10 +380,11 @@ class Main {
274380 this . #_helpers. create . packages ( ) ;
275381 this . #_helpers. copy . run ( ) ;
276382 this . #_helpers. extensions . run ( ) ;
383+ this . #_helpers. aliases . check ( ) ;
277384
278385 const et = Date . now ( ) ;
279386 const duration = et - st ;
280- this . #_helpers. print ( `PostBuild finishes in ${ duration } ) ;
387+ this . #_helpers. print ( `PostBuild finished in ${ duration } ) ;
281388 }
282389}
283390
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