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node_modules/chrome-trace-event/dist/trace-event.d.ts

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+/**
+ * trace-event - A library to create a trace of your node app per
+ * Google's Trace Event format:
+ * // JSSTYLED
+ *      https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU
+ */
+/// <reference types="node" />
+import { Readable as ReadableStream } from "stream";
+export interface Event {
+    ts: number;
+    pid: number;
+    tid: number;
+    /** event phase */
+    ph?: string;
+    [otherData: string]: any;
+}
+export interface Fields {
+    cat?: any;
+    args?: any;
+    [filedName: string]: any;
+}
+export interface TracerOptions {
+    parent?: Tracer | null;
+    fields?: Fields | null;
+    objectMode?: boolean | null;
+    noStream?: boolean;
+}
+export declare class Tracer extends ReadableStream {
+    private _objectMode;
+    /** Node Stream internal APIs */
+    private _push;
+    private firstPush?;
+    private noStream;
+    private events;
+    private parent;
+    private fields;
+    constructor(opts?: TracerOptions);
+    /**
+     * If in no streamMode in order to flush out the trace
+     * you need to call flush.
+     */
+    flush(): void;
+    _read(_: number): void;
+    private _pushString;
+    private _flush;
+    child(fields: Fields): Tracer;
+    begin(fields: Fields): void;
+    end(fields: Fields): void;
+    completeEvent(fields: Fields): void;
+    instantEvent(fields: Fields): void;
+    mkEventFunc(ph: string): (fields: Fields) => void;
+}

node_modules/chrome-trace-event/dist/trace-event.js

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+"use strict";
+/**
+ * trace-event - A library to create a trace of your node app per
+ * Google's Trace Event format:
+ * // JSSTYLED
+ *      https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Tracer = void 0;
+const stream_1 = require("stream");
+function evCommon() {
+    var hrtime = process.hrtime(); // [seconds, nanoseconds]
+    var ts = hrtime[0] * 1000000 + Math.round(hrtime[1] / 1000); // microseconds
+    return {
+        ts,
+        pid: process.pid,
+        tid: process.pid // no meaningful tid for node.js
+    };
+}
+class Tracer extends stream_1.Readable {
+    constructor(opts = {}) {
+        super();
+        this.noStream = false;
+        this.events = [];
+        if (typeof opts !== "object") {
+            throw new Error("Invalid options passed (must be an object)");
+        }
+        if (opts.parent != null && typeof opts.parent !== "object") {
+            throw new Error("Invalid option (parent) passed (must be an object)");
+        }
+        if (opts.fields != null && typeof opts.fields !== "object") {
+            throw new Error("Invalid option (fields) passed (must be an object)");
+        }
+        if (opts.objectMode != null &&
+            (opts.objectMode !== true && opts.objectMode !== false)) {
+            throw new Error("Invalid option (objectsMode) passed (must be a boolean)");
+        }
+        this.noStream = opts.noStream || false;
+        this.parent = opts.parent;
+        if (this.parent) {
+            this.fields = Object.assign({}, opts.parent && opts.parent.fields);
+        }
+        else {
+            this.fields = {};
+        }
+        if (opts.fields) {
+            Object.assign(this.fields, opts.fields);
+        }
+        if (!this.fields.cat) {
+            // trace-viewer *requires* `cat`, so let's have a fallback.
+            this.fields.cat = "default";
+        }
+        else if (Array.isArray(this.fields.cat)) {
+            this.fields.cat = this.fields.cat.join(",");
+        }
+        if (!this.fields.args) {
+            // trace-viewer *requires* `args`, so let's have a fallback.
+            this.fields.args = {};
+        }
+        if (this.parent) {
+            // TODO: Not calling Readable ctor here. Does that cause probs?
+            //      Probably if trying to pipe from the child.
+            //      Might want a serpate TracerChild class for these guys.
+            this._push = this.parent._push.bind(this.parent);
+        }
+        else {
+            this._objectMode = Boolean(opts.objectMode);
+            var streamOpts = { objectMode: this._objectMode };
+            if (this._objectMode) {
+                this._push = this.push;
+            }
+            else {
+                this._push = this._pushString;
+                streamOpts.encoding = "utf8";
+            }
+            stream_1.Readable.call(this, streamOpts);
+        }
+    }
+    /**
+     * If in no streamMode in order to flush out the trace
+     * you need to call flush.
+     */
+    flush() {
+        if (this.noStream === true) {
+            for (const evt of this.events) {
+                this._push(evt);
+            }
+            this._flush();
+        }
+    }
+    _read(_) { }
+    _pushString(ev) {
+        var separator = "";
+        if (!this.firstPush) {
+            this.push("[");
+            this.firstPush = true;
+        }
+        else {
+            separator = ",\n";
+        }
+        this.push(separator + JSON.stringify(ev), "utf8");
+    }
+    _flush() {
+        if (!this._objectMode) {
+            this.push("]");
+        }
+    }
+    child(fields) {
+        return new Tracer({
+            parent: this,
+            fields: fields
+        });
+    }
+    begin(fields) {
+        return this.mkEventFunc("B")(fields);
+    }
+    end(fields) {
+        return this.mkEventFunc("E")(fields);
+    }
+    completeEvent(fields) {
+        return this.mkEventFunc("X")(fields);
+    }
+    instantEvent(fields) {
+        return this.mkEventFunc("I")(fields);
+    }
+    mkEventFunc(ph) {
+        return (fields) => {
+            var ev = evCommon();
+            // Assign the event phase.
+            ev.ph = ph;
+            if (fields) {
+                if (typeof fields === "string") {
+                    ev.name = fields;
+                }
+                else {
+                    for (const k of Object.keys(fields)) {
+                        if (k === "cat") {
+                            ev.cat = fields.cat.join(",");
+                        }
+                        else {
+                            ev[k] = fields[k];
+                        }
+                    }
+                }
+            }
+            if (!this.noStream) {
+                this._push(ev);
+            }
+            else {
+                this.events.push(ev);
+            }
+        };
+    }
+}
+exports.Tracer = Tracer;
+/*
+ * These correspond to the "Async events" in the Trace Events doc.
+ *
+ * Required fields:
+ * - name
+ * - id
+ *
+ * Optional fields:
+ * - cat (array)
+ * - args (object)
+ * - TODO: stack fields, other optional fields?
+ *
+ * Dev Note: We don't explicitly assert that correct fields are
+ * used for speed (premature optimization alert!).
+ */