diff --git a/.eslintrc b/.eslintrc
index 1d8cf81a943..6fef2c2c1d1 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -259,6 +259,14 @@
   },
 
   "overrides": [
+    {
+      "files": [
+        "packages/react-native-symbolicate/**/*.js",
+      ],
+      "env": {
+        "node": true,
+      },
+    },
     {
       "files": [
         "**/__fixtures__/**/*.js",
diff --git a/packages/react-native-symbolicate/BUCK b/packages/react-native-symbolicate/BUCK
new file mode 100644
index 00000000000..2a4a30279d5
--- /dev/null
+++ b/packages/react-native-symbolicate/BUCK
@@ -0,0 +1,54 @@
+load("@fbsource//tools/build_defs:fb_native_wrapper.bzl", "fb_native")
+load("@fbsource//tools/build_defs/third_party:node_defs.bzl", "nodejs_binary")
+load("@fbsource//tools/build_defs/third_party:yarn_defs.bzl", "yarn_install", "yarn_workspace")
+
+yarn_workspace(
+    name = "yarn-workspace",
+    srcs = glob(
+        ["**/*.js"],
+        exclude = [
+            "**/__fixtures__/**",
+            "**/__flowtests__/**",
+            "**/__mocks__/**",
+            "**/__tests__/**",
+            "**/node_modules/**",
+            "**/node_modules/.bin/**",
+            "**/.*",
+            "**/.*/**",
+            "**/.*/.*",
+            "**/*.xcodeproj/**",
+            "**/*.xcworkspace/**",
+        ],
+    ),
+    visibility = ["PUBLIC"],
+)
+
+yarn_install(
+    name = "node-modules",
+    extra_srcs = [
+        "symbolicate.js",
+        "Symbolication.js",
+    ],
+)
+
+nodejs_binary(
+    name = "symbolicate",
+    main = [
+        ":node-modules",
+        "symbolicate.js",
+    ],
+    node_args = [
+        "--max-old-space-size=8192",
+        "--stack_size=10000",
+    ],
+    visibility = ["PUBLIC"],
+)
+
+fb_native.sh_test(
+    name = "symbolicate-integration-test",
+    args = ["$(exe :symbolicate)"],
+    test = "tests/symbolicate_test.sh",
+    deps = [
+        ":symbolicate",
+    ],
+)
diff --git a/packages/react-native-symbolicate/Symbolication.js b/packages/react-native-symbolicate/Symbolication.js
new file mode 100644
index 00000000000..fd340700d80
--- /dev/null
+++ b/packages/react-native-symbolicate/Symbolication.js
@@ -0,0 +1,263 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+'use strict';
+
+/* eslint-disable no-console */
+
+const fs = require('fs');
+
+const UNKNOWN_MODULE_IDS = {
+  segmentId: 0,
+  localId: undefined,
+};
+
+/*
+ * If the file name of a stack frame is numeric (+ ".js"), we assume it's a
+ * lazily injected module coming from a "random access bundle". We are using
+ * special source maps for these bundles, so that we can symbolicate stack
+ * traces for multiple injected files with a single source map.
+ *
+ * There is also a convention for callsites that are in split segments of a
+ * bundle, named either `seg-3.js` for segment #3 for example, or `seg-3_5.js`
+ * for module #5 of segment #3 of a segmented RAM bundle.
+ */
+function parseFileName(str) {
+  const modMatch = str.match(/^(\d+).js$/);
+  if (modMatch != null) {
+    return {segmentId: 0, localId: Number(modMatch[1])};
+  }
+  const segMatch = str.match(/^seg-(\d+)(?:_(\d+))?.js$/);
+  if (segMatch != null) {
+    return {
+      segmentId: Number(segMatch[1]),
+      localId: segMatch[2] && Number(segMatch[2]),
+    };
+  }
+  return UNKNOWN_MODULE_IDS;
+}
+
+/*
+ * A helper function to return a mapping {line, column} object for a given input
+ * line and column, and optionally a module ID.
+ */
+function getOriginalPositionFor(lineNumber, columnNumber, moduleIds, context) {
+  var moduleLineOffset = 0;
+  var metadata = context.segments[moduleIds.segmentId];
+  const {localId} = moduleIds;
+  if (localId != null) {
+    const {moduleOffsets} = metadata;
+    if (!moduleOffsets) {
+      throw new Error(
+        'Module ID given for a source map that does not have ' +
+          'an x_facebook_offsets field',
+      );
+    }
+    if (moduleOffsets[localId] == null) {
+      throw new Error('Unknown module ID: ' + localId);
+    }
+    moduleLineOffset = moduleOffsets[localId];
+  }
+  return metadata.consumer.originalPositionFor({
+    line: Number(lineNumber) + moduleLineOffset,
+    column: Number(columnNumber),
+  });
+}
+
+function createContext(SourceMapConsumer, sourceMapContent) {
+  var sourceMapJson = JSON.parse(sourceMapContent.replace(/^\)\]\}'/, ''));
+  return {
+    segments: Object.entries(sourceMapJson.x_facebook_segments || {}).reduce(
+      (acc, seg) => {
+        acc[seg[0]] = {
+          consumer: new SourceMapConsumer(seg[1]),
+          moduleOffsets: seg[1].x_facebook_offsets || {},
+        };
+        return acc;
+      },
+      {
+        '0': {
+          consumer: new SourceMapConsumer(sourceMapJson),
+          moduleOffsets: sourceMapJson.x_facebook_offsets || {},
+        },
+      },
+    ),
+  };
+}
+
+// parse stack trace with String.replace
+// replace the matched part of stack trace to symbolicated result
+// sample stack trace:
+//  IOS: foo@4:18131, Android: bar:4:18063
+// sample stack trace with module id:
+//  IOS: foo@123.js:4:18131, Android: bar:123.js:4:18063
+// sample result:
+//  IOS: foo.js:57:foo, Android: bar.js:75:bar
+function symbolicate(stackTrace, context) {
+  return stackTrace.replace(
+    /(?:([^@: \n]+)(@|:))?(?:(?:([^@: \n]+):)?(\d+):(\d+)|\[native code\])/g,
+    function(match, func, delimiter, fileName, line, column) {
+      var original = getOriginalPositionFor(
+        line,
+        column,
+        parseFileName(fileName || ''),
+        context,
+      );
+      return original.source + ':' + original.line + ':' + original.name;
+    },
+  );
+}
+
+// Taking in a map like
+// trampoline offset (optional js function name)
+// JS_0158_xxxxxxxxxxxxxxxxxxxxxx fe 91081
+// JS_0159_xxxxxxxxxxxxxxxxxxxxxx Ft 68651
+// JS_0160_xxxxxxxxxxxxxxxxxxxxxx value 50700
+// JS_0161_xxxxxxxxxxxxxxxxxxxxxx setGapAtCursor 0
+// JS_0162_xxxxxxxxxxxxxxxxxxxxxx (unknown) 50818
+// JS_0163_xxxxxxxxxxxxxxxxxxxxxx value 108267
+
+function symbolicateProfilerMap(mapFile, context) {
+  return fs
+    .readFileSync(mapFile, 'utf8')
+    .split('\n')
+    .slice(0, -1)
+    .map(function(line) {
+      const line_list = line.split(' ');
+      const trampoline = line_list[0];
+      const js_name = line_list[1];
+      const offset = parseInt(line_list[2], 10);
+
+      if (!offset) {
+        return trampoline + ' ' + trampoline;
+      }
+
+      var original = getOriginalPositionFor(
+        1,
+        offset,
+        UNKNOWN_MODULE_IDS,
+        context,
+      );
+
+      return (
+        trampoline +
+        ' ' +
+        (original.name || js_name) +
+        '::' +
+        [original.source, original.line, original.column].join(':')
+      );
+    })
+    .join('\n');
+}
+
+function symbolicateAttribution(obj, context) {
+  var loc = obj.location;
+  var line = loc.line || 1;
+  var column = loc.column || loc.virtualOffset;
+  var file = loc.filename ? parseFileName(loc.filename) : UNKNOWN_MODULE_IDS;
+  var original = getOriginalPositionFor(line, column, file, context);
+  obj.location = {
+    file: original.source,
+    line: original.line,
+    column: original.column,
+  };
+}
+
+// Symbolicate chrome trace "stackFrames" section.
+// Each frame in it has three fields: name, funcVirtAddr(optional), offset(optional).
+// funcVirtAddr and offset are only available if trace is generated from
+// hbc bundle without debug info.
+function symbolicateChromeTrace(traceFile, context) {
+  const contentJson = JSON.parse(fs.readFileSync(traceFile, 'utf8'));
+  if (contentJson.stackFrames == null) {
+    console.error('Unable to locate `stackFrames` section in trace.');
+    process.exit(1);
+  }
+  console.log(
+    'Processing ' + Object.keys(contentJson.stackFrames).length + ' frames',
+  );
+  Object.values(contentJson.stackFrames).forEach(function(entry) {
+    let line;
+    let column;
+
+    // Function entrypoint line/column; used for symbolicating function name.
+    let funcLine;
+    let funcColumn;
+
+    if (entry.funcVirtAddr != null && entry.offset != null) {
+      // Without debug information.
+      const funcVirtAddr = parseInt(entry.funcVirtAddr, 10);
+      const offsetInFunction = parseInt(entry.offset, 10);
+      // Main bundle always use hard-coded line value 1.
+      // TODO: support multiple bundle/module.
+      line = 1;
+      column = funcVirtAddr + offsetInFunction;
+      funcLine = 1;
+      funcColumn = funcVirtAddr;
+    } else if (entry.line != null && entry.column != null) {
+      // For hbc bundle with debug info, name field may already have source
+      // information for the bundle; we still can use babel/metro/prepack
+      // source map to symbolicate the bundle frame addresses further to its
+      // original source code.
+      line = entry.line;
+      column = entry.column;
+
+      funcLine = entry.funcLine;
+      funcColumn = entry.funcColumn;
+    } else {
+      // Native frames.
+      return;
+    }
+
+    // Symbolicate original file/line/column.
+    const addressOriginal = getOriginalPositionFor(
+      line,
+      column,
+      UNKNOWN_MODULE_IDS,
+      context,
+    );
+
+    let frameName = entry.name;
+    // Symbolicate function name.
+    if (funcLine != null && funcColumn != null) {
+      const funcOriginal = getOriginalPositionFor(
+        funcLine,
+        funcColumn,
+        UNKNOWN_MODULE_IDS,
+        context,
+      );
+      if (funcOriginal.name != null) {
+        frameName = funcOriginal.name;
+      }
+    } else {
+      // No function line/column info.
+      console.warn(
+        'Warning: no function prolog line/column info; name may be wrong',
+      );
+    }
+
+    // Output format is: funcName(file:line:column)
+    const sourceLocation = `(${addressOriginal.source}:${
+      addressOriginal.line
+    }:${addressOriginal.column})`;
+    entry.name = frameName + sourceLocation;
+  });
+  console.log('Writing to ' + traceFile);
+  fs.writeFileSync(traceFile, JSON.stringify(contentJson));
+}
+
+module.exports = {
+  createContext,
+  getOriginalPositionFor,
+  parseFileName,
+  symbolicate,
+  symbolicateProfilerMap,
+  symbolicateAttribution,
+  symbolicateChromeTrace,
+};
diff --git a/packages/react-native-symbolicate/package.json b/packages/react-native-symbolicate/package.json
new file mode 100644
index 00000000000..2c7c8d7f578
--- /dev/null
+++ b/packages/react-native-symbolicate/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "react-native-symbolicate",
+  "version": "0.0.1",
+  "dependencies": {
+    "source-map": "^0.5.6",
+    "through2": "^2.0.1"
+  }
+}
diff --git a/packages/react-native-symbolicate/symbolicate.js b/packages/react-native-symbolicate/symbolicate.js
new file mode 100644
index 00000000000..294bff1d578
--- /dev/null
+++ b/packages/react-native-symbolicate/symbolicate.js
@@ -0,0 +1,103 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * Symbolicates a JavaScript stack trace using a source map.
+ * In our first form, we read a stack trace from stdin and symbolicate it via
+ * the provided source map.
+ * In our second form, we symbolicate using an explicit line number, and
+ * optionally a column.
+ * In our third form, we symbolicate using a module ID, a line number, and
+ * optionally a column.
+ *
+ * See https://our.intern.facebook.com/intern/dex/symbolicating-javascript-stack-traces-for-react-native/
+ *
+ * @flow
+ * @format
+ */
+
+'use strict';
+
+var SourceMapConsumer = require('source-map').SourceMapConsumer;
+var Symbolication = require('./Symbolication.js');
+
+var fs = require('fs');
+var through2 = require('through2');
+
+var argv = process.argv.slice(2);
+if (argv.length < 1 || argv.length > 3) {
+  /* eslint no-path-concat: "off" */
+  var usages = [
+    'Usage: ' + __filename + ' <source-map-file>',
+    '       ' + __filename + ' <source-map-file> <line> [column]',
+    '       ' + __filename + ' <source-map-file> <moduleId>.js <line> [column]',
+    '       ' + __filename + ' <source-map-file> <mapfile>.profmap',
+    '       ' +
+      __filename +
+      ' <source-map-file> --attribution < attribution.jsonl  > symbolicated.jsonl',
+    '       ' + __filename + ' <source-map-file> <tracefile>.cpuprofile',
+  ];
+  console.error(usages.join('\n'));
+  process.exit(1);
+}
+
+// Read the source map.
+var sourceMapFileName = argv.shift();
+var content = fs.readFileSync(sourceMapFileName, 'utf8');
+var context = Symbolication.createContext(SourceMapConsumer, content);
+
+if (argv.length === 0) {
+  // read-from-stdin form.
+  var stackTrace = fs.readFileSync('/dev/stdin', 'utf8');
+  var result = Symbolication.symbolicate(stackTrace, context);
+  process.stdout.write(result);
+} else if (argv[0].endsWith('.profmap')) {
+  process.stdout.write(Symbolication.symbolicateProfilerMap(argv[0], context));
+} else if (argv[0] === '--attribution') {
+  var buffer = '';
+  process.stdin
+    .pipe(
+      through2(function(data, enc, callback) {
+        // Take arbitrary strings, output single lines
+        buffer += data;
+        var lines = buffer.split('\n');
+        for (var i = 0, e = lines.length - 1; i < e; i++) {
+          this.push(lines[i]);
+        }
+        buffer = lines[lines.length - 1];
+        callback();
+      }),
+    )
+    .pipe(
+      through2.obj(function(data, enc, callback) {
+        // This is JSONL, so each line is a separate JSON object
+        var obj = JSON.parse(data);
+        Symbolication.symbolicateAttribution(obj, context);
+        this.push(JSON.stringify(obj) + '\n');
+        callback();
+      }),
+    )
+    .pipe(process.stdout);
+} else if (argv[0].endsWith('.cpuprofile')) {
+  Symbolication.symbolicateChromeTrace(argv[0], context);
+} else {
+  // read-from-argv form.
+  var moduleIds, lineNumber, columnNumber;
+  if (argv[0].endsWith('.js')) {
+    moduleIds = Symbolication.parseFileName(argv[1]);
+    argv.shift();
+  } else {
+    moduleIds = {segmentId: 0, localId: undefined};
+  }
+  lineNumber = argv.shift();
+  columnNumber = argv.shift() || 0;
+  var original = Symbolication.getOriginalPositionFor(
+    lineNumber,
+    columnNumber,
+    moduleIds,
+    context,
+  );
+  console.log(original.source + ':' + original.line + ':' + original.name);
+}
diff --git a/packages/react-native-symbolicate/tests/symbolicate_test.sh b/packages/react-native-symbolicate/tests/symbolicate_test.sh
new file mode 100755
index 00000000000..e3fcca1b268
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/symbolicate_test.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+SYMBOLICATE_CMD="$1"
+cd "$( dirname "${BASH_SOURCE[0]}" )" || exit 1
+
+exitcode=0
+trap 'exit $exitcode' EXIT
+
+can() {
+  /usr/bin/diff >&2 -U5 "${@:2}" || {
+    exitcode=$?
+    printf >&2 "FAIL: can't %s\\n" "$1"
+  }
+}
+
+symbolicate() {
+  $SYMBOLICATE_CMD "$@"
+}
+
+
+can "symbolicate a stack trace" \
+  <(symbolicate testfile.js.map < testfile.stack) \
+  testfile.symbolicated.stack
+
+can "symbolicate a single entry" \
+  <(symbolicate testfile.js.map 1 161) \
+  <(echo thrower.js:18:null)
+
+can "symbolicate a profiler map" \
+  <(symbolicate testfile.js.map testfile.profmap) \
+  testfile.symbolicated.profmap
+
+can "symbolicate an attribution file" \
+  <(symbolicate testfile.js.map --attribution < testfile.attribution.input) \
+  testfile.attribution.output
+
+cp testfile.cpuprofile testfile.temp.cpuprofile
+($SYMBOLICATE_CMD testfile.cpuprofile.map testfile.temp.cpuprofile)
+if ! /usr/bin/diff testfile.temp.cpuprofile -U5 \
+  testfile.symbolicated.cpuprofile; then
+ rm testfile.temp.cpuprofile
+ exit 1
+fi
+rm testfile.temp.cpuprofile
diff --git a/packages/react-native-symbolicate/tests/testfile.attribution.input b/packages/react-native-symbolicate/tests/testfile.attribution.input
new file mode 100644
index 00000000000..0d80b222509
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.attribution.input
@@ -0,0 +1,2 @@
+{"functionId":1,"location":{"virtualOffset":22},"usage":[]}
+{"functionId":2,"location":{"virtualOffset":99},"usage":[]}
diff --git a/packages/react-native-symbolicate/tests/testfile.attribution.output b/packages/react-native-symbolicate/tests/testfile.attribution.output
new file mode 100644
index 00000000000..be5d0512d57
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.attribution.output
@@ -0,0 +1,2 @@
+{"functionId":1,"location":{"file":"thrower.js","line":4,"column":11},"usage":[]}
+{"functionId":2,"location":{"file":"thrower.js","line":14,"column":14},"usage":[]}
diff --git a/packages/react-native-symbolicate/tests/testfile.cpuprofile b/packages/react-native-symbolicate/tests/testfile.cpuprofile
new file mode 100644
index 00000000000..6270b03750e
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.cpuprofile
@@ -0,0 +1,42 @@
+{
+  "stackFrames": {
+    "1": {
+      "funcVirtAddr": "0",
+      "offset": "0",
+      "name": "global+0",
+      "category": "JavaScript"
+    },
+    "2": {
+      "funcVirtAddr": "0",
+      "offset": "55",
+      "name": "global+55",
+      "category": "JavaScript"
+    },
+    "3": {
+      "funcVirtAddr": "67",
+      "offset": "16",
+      "name": "entryPoint+16",
+      "category": "JavaScript",
+      "parent": 2
+    },
+    "4": {
+      "funcVirtAddr": "89",
+      "offset": "0",
+      "name": "helper+0",
+      "category": "JavaScript",
+      "parent": 3
+    },
+    "5": {
+      "funcVirtAddr": "89",
+      "offset": "146",
+      "name": "helper+146",
+      "category": "JavaScript",
+      "parent": 3
+    },
+    "6": {
+      "name": "[Native]4367295792",
+      "category": "Native",
+      "parent": 5
+    }
+  }
+}
diff --git a/packages/react-native-symbolicate/tests/testfile.cpuprofile.map b/packages/react-native-symbolicate/tests/testfile.cpuprofile.map
new file mode 100644
index 00000000000..9b0c31c6d05
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.cpuprofile.map
@@ -0,0 +1,7 @@
+{
+  "version": 3,
+  "sources": [
+    "temp/bench.js"
+  ],
+  "mappings": "AACC,uDAmBU,YAnBY,gBACd,MAGU,wFAKA,WACT,iBACC,IAAD,YACU,cAAA,YAHY,eAAb;"
+}
diff --git a/packages/react-native-symbolicate/tests/testfile.js.map b/packages/react-native-symbolicate/tests/testfile.js.map
new file mode 100644
index 00000000000..636c74a153e
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.js.map
@@ -0,0 +1,2 @@
+{"version":3,"sources":["thrower.js"],"names":["notCalled","alsoNotCalled","throws6a","Error","throws6","throws6b","throws4","obj","throws5","apply","this","throws2","throws3","throws1","throws0","t","eval","o","forEach","call","arguments","arg","err","print","stack"],"mappings":"CAAA,WAGE,SAASA,YACP,SAASC,IACPA,IAEFA,IACAD,YAIF,SAASE,WACP,MAAM,IAAIC,MAAM,wBAGlB,SAASC,UACP,MAAM,IAAID,MAAM,wBAGlB,SAASE,WACP,MAAM,IAAIF,MAAM,wBAYlB,SAASG,UACPC,IAAIC,EAAQC,MAAMC,MAAON,QAASA,QAASA,UAG7C,SAASO,UACPJ,IAAIK,IAGN,SAASC,UAELF,UAIJ,SAASG,UACPD,UAxBF,IAAIN,KACFQ,EAAS,WACPC,KAAK,eAEPC,EAAS,cACJC,QAAQC,KAAKC,UAAW,SAASC,GAAOA,QAsB/C,IACEP,UACA,MAAOQ,GACPC,MAAMD,EAAIE,QAtDd"}
+
diff --git a/packages/react-native-symbolicate/tests/testfile.profmap b/packages/react-native-symbolicate/tests/testfile.profmap
new file mode 100644
index 00000000000..f2c26d89be2
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.profmap
@@ -0,0 +1,4 @@
+JS_0000_xxxxxxxxxxxxxxxxxxxxxx (unknown) 373
+JS_0001_xxxxxxxxxxxxxxxxxxxxxx garbage 296
+JS_0002_xxxxxxxxxxxxxxxxxxxxxx name 1234
+JS_0003_xxxxxxxxxxxxxxxxxxxxxx (unknown) 5678
diff --git a/packages/react-native-symbolicate/tests/testfile.stack b/packages/react-native-symbolicate/tests/testfile.stack
new file mode 100644
index 00000000000..fedb815fb01
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.stack
@@ -0,0 +1,13 @@
+throws6@thrower.min.js:1:161
+thrower.min.js:1:488
+forEach@[native code]
+o@thrower.min.js:1:464
+throws4@thrower.min.js:1:276
+eval code
+eval@[native code]
+t@thrower.min.js:1:420
+throws2@thrower.min.js:1:333
+throws1@thrower.min.js:1:362
+throws0@thrower.min.js:1:391
+thrower.min.js:1:506
+global code@thrower.min.js:1:534
diff --git a/packages/react-native-symbolicate/tests/testfile.symbolicated.cpuprofile b/packages/react-native-symbolicate/tests/testfile.symbolicated.cpuprofile
new file mode 100644
index 00000000000..074c3cb6008
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.symbolicated.cpuprofile
@@ -0,0 +1 @@
+{"stackFrames":{"1":{"funcVirtAddr":"0","offset":"0","name":"global+0(temp/bench.js:2:1)","category":"JavaScript"},"2":{"funcVirtAddr":"0","offset":"55","name":"global+55(temp/bench.js:21:11)","category":"JavaScript"},"3":{"funcVirtAddr":"67","offset":"16","name":"entryPoint+16(temp/bench.js:3:9)","category":"JavaScript","parent":2},"4":{"funcVirtAddr":"89","offset":"0","name":"helper+0(temp/bench.js:6:19)","category":"JavaScript","parent":3},"5":{"funcVirtAddr":"89","offset":"146","name":"helper+146(temp/bench.js:14:20)","category":"JavaScript","parent":3},"6":{"name":"[Native]4367295792","category":"Native","parent":5}}}
\ No newline at end of file
diff --git a/packages/react-native-symbolicate/tests/testfile.symbolicated.profmap b/packages/react-native-symbolicate/tests/testfile.symbolicated.profmap
new file mode 100644
index 00000000000..5c3a5064ba8
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.symbolicated.profmap
@@ -0,0 +1,4 @@
+JS_0000_xxxxxxxxxxxxxxxxxxxxxx throws0::thrower.js:48:11
+JS_0001_xxxxxxxxxxxxxxxxxxxxxx throws6::thrower.js:35:38
+JS_0002_xxxxxxxxxxxxxxxxxxxxxx name::thrower.js:1:0
+JS_0003_xxxxxxxxxxxxxxxxxxxxxx (unknown)::thrower.js:1:0
\ No newline at end of file
diff --git a/packages/react-native-symbolicate/tests/testfile.symbolicated.stack b/packages/react-native-symbolicate/tests/testfile.symbolicated.stack
new file mode 100644
index 00000000000..77a56bf7e68
--- /dev/null
+++ b/packages/react-native-symbolicate/tests/testfile.symbolicated.stack
@@ -0,0 +1,13 @@
+thrower.js:18:null
+thrower.js:30:arg
+null:null:null
+thrower.js:30:arguments
+thrower.js:35:this
+eval code
+null:null:null
+thrower.js:27:null
+thrower.js:39:throws3
+thrower.js:44:throws2
+thrower.js:49:throws1
+thrower.js:53:throws0
+global thrower.js:1:null
diff --git a/packages/react-native-symbolicate/yarn.lock b/packages/react-native-symbolicate/yarn.lock
new file mode 100644
index 00000000000..02f92527bc9
--- /dev/null
+++ b/packages/react-native-symbolicate/yarn.lock
@@ -0,0 +1,71 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+core-util-is@~1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
+  integrity sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=
+
+inherits@~2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+  integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
+
+isarray@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
+  integrity sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=
+
+process-nextick-args@~2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.0.tgz#a37d732f4271b4ab1ad070d35508e8290788ffaa"
+  integrity sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==
+
+readable-stream@~2.3.6:
+  version "2.3.6"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
+  integrity sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==
+  dependencies:
+    core-util-is "~1.0.0"
+    inherits "~2.0.3"
+    isarray "~1.0.0"
+    process-nextick-args "~2.0.0"
+    safe-buffer "~5.1.1"
+    string_decoder "~1.1.1"
+    util-deprecate "~1.0.1"
+
+safe-buffer@~5.1.0, safe-buffer@~5.1.1:
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
+  integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
+
+source-map@^0.5.6:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
+  integrity sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=
+
+string_decoder@~1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.1.1.tgz#9cf1611ba62685d7030ae9e4ba34149c3af03fc8"
+  integrity sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==
+  dependencies:
+    safe-buffer "~5.1.0"
+
+through2@^2.0.1:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.5.tgz#01c1e39eb31d07cb7d03a96a70823260b23132cd"
+  integrity sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==
+  dependencies:
+    readable-stream "~2.3.6"
+    xtend "~4.0.1"
+
+util-deprecate@~1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
+  integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=
+
+xtend@~4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
+  integrity sha1-pcbVMr5lbiPbgg77lDofBJmNY68=