mapping-entry.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getAbsoluteMappingEntries = void 0;
var path = require("path");
/**
* Converts an absolute baseUrl and paths to an array of absolute mapping entries.
* The array is sorted by longest prefix.
* Having an array with entries allows us to keep a sorting order rather than
* sort by keys each time we use the mappings.
* @param absoluteBaseUrl
* @param paths
* @param addMatchAll
*/
function getAbsoluteMappingEntries(absoluteBaseUrl, paths, addMatchAll) {
// Resolve all paths to absolute form once here, and sort them by
// longest prefix once here, this saves time on each request later.
// We need to put them in an array to preserve the sorting order.
var sortedKeys = sortByLongestPrefix(Object.keys(paths));
var absolutePaths = [];
for (var _i = 0, sortedKeys_1 = sortedKeys; _i < sortedKeys_1.length; _i++) {
var key = sortedKeys_1[_i];
absolutePaths.push({
pattern: key,
paths: paths[key].map(function (pathToResolve) {
return path.join(absoluteBaseUrl, pathToResolve);
}),
});
}
// If there is no match-all path specified in the paths section of tsconfig, then try to match
// all paths relative to baseUrl, this is how typescript works.
if (!paths["*"] && addMatchAll) {
absolutePaths.push({
pattern: "*",
paths: ["".concat(absoluteBaseUrl.replace(/\/$/, ""), "/*")],
});
}
return absolutePaths;
}
exports.getAbsoluteMappingEntries = getAbsoluteMappingEntries;
/**
* Sort path patterns.
* If a module name can be matched with multiple patterns then pattern with the longest prefix will be picked.
*/
function sortByLongestPrefix(arr) {
return arr
.concat()
.sort(function (a, b) { return getPrefixLength(b) - getPrefixLength(a); });
}
function getPrefixLength(pattern) {
var prefixLength = pattern.indexOf("*");
return pattern.substr(0, prefixLength).length;
}
//# sourceMappingURL=mapping-entry.js.map