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@ -1,8 +1,7 @@
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import remapping from '@ampproject/remapping';
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import { SourceMapInput, RawSourceMap, DecodedSourceMap } from '@ampproject/remapping/dist/types/types';
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import { SourceMapInput, SourceMapLoader, RawSourceMap, DecodedSourceMap } from '@ampproject/remapping/dist/types/types';
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import { decode as decode_mappings } from 'sourcemap-codec';
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import { decode as decode_mappings } from 'sourcemap-codec';
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import { getLocator } from 'locate-character';
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import { getLocator } from 'locate-character';
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import { StringWithSourcemap, sourcemap_add_offset } from '../utils/string_with_sourcemap';
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import { StringWithSourcemap, sourcemap_add_offset, combine_sourcemaps, combine_sourcemaps_map_stats } from '../utils/string_with_sourcemap';
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export interface Processed {
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export interface Processed {
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code: string;
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code: string;
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@ -113,10 +112,17 @@ function get_replacement(
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export default async function preprocess(
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export default async function preprocess(
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source: string,
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source: string,
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preprocessor: PreprocessorGroup | PreprocessorGroup[],
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preprocessor: PreprocessorGroup | PreprocessorGroup[],
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options?: { filename?: string }
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options?: {
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filename?: string,
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sourcemapWarnLoss?: number, // default 0.5
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sourcemapEncodedWarn?: boolean // default true
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}
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) {
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) {
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// @ts-ignore todo: doublecheck
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// @ts-ignore todo: doublecheck
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const filename = (options && options.filename) || preprocessor.filename; // legacy
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const filename = (options && options.filename) || preprocessor.filename; // legacy
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const sourcemapWarnLoss = (options && options.sourcemapWarnLoss != undefined) ? options.sourcemapWarnLoss : 0.5;
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const sourcemapEncodedWarn = (options && options.sourcemapEncodedWarn != undefined) ? options.sourcemapEncodedWarn : true;
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const dependencies = [];
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const dependencies = [];
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const preprocessors = preprocessor
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const preprocessors = preprocessor
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@ -130,7 +136,9 @@ export default async function preprocess(
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// sourcemap_list is sorted in reverse order from last map (index 0) to first map (index -1)
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// sourcemap_list is sorted in reverse order from last map (index 0) to first map (index -1)
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// so we use sourcemap_list.unshift() to add new maps
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// so we use sourcemap_list.unshift() to add new maps
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// https://github.com/ampproject/remapping#multiple-transformations-of-a-file
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// https://github.com/ampproject/remapping#multiple-transformations-of-a-file
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const sourcemap_list: (DecodedSourceMap | RawSourceMap)[] = [];
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const sourcemap_list: Array<DecodedSourceMap | RawSourceMap> = [];
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// TODO keep track: what preprocessor generated what sourcemap? to make debugging easier = detect low-resolution sourcemaps in fn combine_mappings
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for (const fn of markup) {
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for (const fn of markup) {
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@ -150,6 +158,8 @@ export default async function preprocess(
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);
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);
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}
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}
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// TODO run script and style in parallel
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for (const fn of script) {
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for (const fn of script) {
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const get_location = getLocator(source);
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const get_location = getLocator(source);
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const res = await replace_async(
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const res = await replace_async(
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@ -216,37 +226,41 @@ export default async function preprocess(
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sourcemap_list.unshift(res.map);
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sourcemap_list.unshift(res.map);
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}
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}
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let map: RawSourceMap;
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const map_stats: combine_sourcemaps_map_stats = {
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let map_idx = 0;
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sourcemapWarnLoss,
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try {
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sourcemapEncodedWarn
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map =
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// property `result` is set by combine_sourcemaps
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sourcemap_list.length == 0
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};
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? null
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: sourcemap_list.slice(0, -1).find(m => m.sources.length !== 1) === undefined
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const map: DecodedSourceMap = combine_sourcemaps(
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? remapping( // use array interface
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filename,
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sourcemap_list,
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sourcemap_list,
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() => null,
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map_stats,
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true // skip optional field `sourcesContent`
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true // explicitly decode mappings
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)
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// TODO remove this, when `remapping` allows to return decoded mappings, so we skip the unnecessary encode + decode steps
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: remapping( // use loader interface
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) as DecodedSourceMap;
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sourcemap_list[map_idx++],
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function loader(sourcefile) {
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// TODO better than console.log?
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if (sourcefile === filename)
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return sourcemap_list[map_idx++] || null;
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if (map_stats.result && map_stats.result.segments_lost) {
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// bundle file = branch node
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const { segment_loss_per_map, segments_per_map } = map_stats.result;
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else return null; // source file = leaf node
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console.log('warning. svelte.preprocess seems to receive low-resolution sourcemaps. '+
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} as SourceMapLoader
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'relative segment loss per combine_sourcemaps step: '+
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);
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segment_loss_per_map.map(f => f.toFixed(2)).join(' -> ')+
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} catch (error) {
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'. absolute number of segments per sourcemap: '+
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throw { ...error, message: error.message +
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segments_per_map.join(' -> ')+
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'\n\ncould not combine sourcemaps:\n' +
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'. make your preprocessors return high-resolution sourcemaps '+
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JSON.stringify(sourcemap_list.map(m => {
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'or increase the tolerated loss with svelte.preprocess(_, _, { sourcemapWarnLoss: 0.8 })'
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return { ...m, mappings: JSON.stringify(m.mappings).slice(0, 100)+' ....'};
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);
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}), null, 2)
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};
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}
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}
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if (map && !map.file) delete map.file; // skip optional field `file`
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if (map_stats.result && map_stats.result.maps_encoded && map_stats.result.maps_encoded.length > 0) {
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console.log('warning. svelte.preprocess received encoded sourcemaps (index '+
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map_stats.result.maps_encoded.join(', ')+'). '+
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'this is slow. make your sourcemap-generators return decoded mappings '+
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'or disable this warning with svelte.preprocess(_, _, { sourcemapEncodedWarn: false })'
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);
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}
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return {
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return {
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// TODO return separated output, in future version where svelte.compile supports it:
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// TODO return separated output, in future version where svelte.compile supports it:
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Milan Hauth
5 years ago