Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { fileURLToPath } from "node:url";
import { type Needle, type TraceMap } from "@jridgewell/trace-mapping";
import {
type CoverageMapData as IstanbulCoverageMapData,
type FileCoverageData,
} from "istanbul-lib-coverage";
// https://github.com/istanbuljs/istanbuljs/blob/main/docs/raw-output.md#branch-types
export type Branch = "if" | "binary-expr" | "cond-expr" | "switch" | "default-arg";
export type CoverageMapData = IstanbulCoverageMapData & {
[key: string]: FileCoverageData;
};
type FileCoverageDataWithMeta = FileCoverageData & { meta: Meta };
type Meta = {
lastFunction: number;
lastBranch: number;
lastStatement: number;
seen: Record<string, number>;
fnNames: Map<string, number>;
};
export function createCoverageMapData(filename: string, sourceMap: TraceMap) {
const data: CoverageMapData = {};
const directory = dirname(filename);
for (const source of sourceMap.sources) {
let path = filename;
Eif (source) {
if (source.startsWith("file://")) {
path = fileURLToPath(source);
} else {
path = resolve(directory, source);
}
}
const meta: Meta = {
lastBranch: 0,
lastFunction: 0,
lastStatement: 0,
seen: {},
fnNames: new Map(),
};
data[path] = {
path,
statementMap: {},
fnMap: {},
branchMap: {},
s: {},
f: {},
b: {},
// @ts-expect-error -- internal
meta,
};
}
return data;
}
export function addFunction(options: {
coverageMapData: CoverageMapData;
filename: string;
name?: string;
covered?: number;
decl: { start: Needle; end: Needle };
loc: { start: Needle; end: Needle };
}) {
const fileCoverage = options.coverageMapData[options.filename];
const meta = (fileCoverage as FileCoverageDataWithMeta).meta;
const key = `f:${cacheKey(options.decl)}`;
let index = meta.seen[key];
if (index == null) {
index = meta.lastFunction;
meta.lastFunction++;
meta.seen[key] = index;
let name = options.name;
if (name) {
const base = name;
let count = (meta.fnNames.get(base) || 0) + 1;
name = count > 1 ? `${base}_${count}` : base;
while (meta.fnNames.has(name)) {
count++;
name = `${base}_${count}`;
}
meta.fnNames.set(base, count);
if (name !== base) {
meta.fnNames.set(name, 0);
}
}
fileCoverage.fnMap[index] = {
name: name || `(anonymous_${index})`,
decl: pickLocation(options.decl),
loc: pickLocation(options.loc),
line: options.loc.start.line,
};
}
fileCoverage.f[index] ||= 0;
fileCoverage.f[index] += options.covered || 0;
}
export function addStatement(options: {
coverageMapData: CoverageMapData;
filename: string;
covered?: number;
loc: { start: Needle; end: Needle };
}) {
const fileCoverage = options.coverageMapData[options.filename];
const meta = (fileCoverage as FileCoverageDataWithMeta).meta;
const key = `s:${cacheKey(options.loc)}`;
let index = meta.seen[key];
if (index == null) {
index = meta.lastStatement;
meta.lastStatement++;
meta.seen[key] = index;
fileCoverage.statementMap[index] = pickLocation(options.loc);
}
fileCoverage.s[index] = options.covered || 0;
}
export function addBranch(options: {
coverageMapData: CoverageMapData;
filename: string;
type: Branch;
loc: { start: Needle; end: Needle };
locations: { start: Partial<Needle>; end: Partial<Needle> }[];
covered?: number[];
}) {
const fileCoverage = options.coverageMapData[options.filename];
const meta = (fileCoverage as FileCoverageDataWithMeta).meta;
const key = ["b", ...options.locations.map(cacheKey)].join(":");
let index = meta.seen[key];
Eif (index == null) {
index = meta.lastBranch;
meta.lastBranch++;
meta.seen[key] = index;
fileCoverage.branchMap[index] = {
loc: pickLocation(options.loc),
type: options.type,
// @ts-expect-error -- Istanbul cheats types for implicit else
locations: options.locations.map((loc) => pickLocation(loc)),
line: options.loc.start.line,
};
}
Eif (!fileCoverage.b[index]) {
fileCoverage.b[index] = Array(options.locations.length).fill(0);
}
options.covered?.forEach((hit, i) => {
if (fileCoverage.b[index][i] !== undefined) {
fileCoverage.b[index][i] += hit;
}
});
}
function pickLocation(loc: { start: Needle; end: Needle }) {
return {
start: { line: loc.start.line, column: loc.start.column },
end: { line: loc.end.line, column: loc.end.column },
};
}
function cacheKey(loc: { start: Partial<Needle>; end: Partial<Needle> }) {
return `${loc.start.line}:${loc.start.column}:${loc.end.line}:${loc.end.column}`;
}
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