diff --git a/packages/react-client/src/ReactFlightClient.js b/packages/react-client/src/ReactFlightClient.js
index 4bdf579afd77b..63342962e2a08 100644
--- a/packages/react-client/src/ReactFlightClient.js
+++ b/packages/react-client/src/ReactFlightClient.js
@@ -50,6 +50,7 @@ import {
   readFinalStringChunk,
   createStringDecoder,
   prepareDestinationForModule,
+  printToConsole,
 } from './ReactFlightClientConfig';
 
 import {registerServerReference} from './ReactFlightReplyClient';
@@ -1094,13 +1095,13 @@ function resolveConsoleEntry(
     );
   }
 
-  const payload: [string, string, mixed] = parseModel(response, value);
+  const payload: [string, string, string, mixed] = parseModel(response, value);
   const methodName = payload[0];
   // TODO: Restore the fake stack before logging.
   // const stackTrace = payload[1];
-  const args = payload.slice(2);
-  // eslint-disable-next-line react-internal/no-production-logging
-  console[methodName].apply(console, args);
+  const env = payload[2];
+  const args = payload.slice(3);
+  printToConsole(methodName, args, env);
 }
 
 function mergeBuffer(
diff --git a/packages/react-client/src/ReactFlightClientConsoleConfigBrowser.js b/packages/react-client/src/ReactFlightClientConsoleConfigBrowser.js
new file mode 100644
index 0000000000000..cc934685c8f7b
--- /dev/null
+++ b/packages/react-client/src/ReactFlightClientConsoleConfigBrowser.js
@@ -0,0 +1,69 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+const badgeFormat = '%c%s%c ';
+// Same badge styling as DevTools.
+const badgeStyle =
+  // We use a fixed background if light-dark is not supported, otherwise
+  // we use a transparent background.
+  'background: #e6e6e6;' +
+  'background: light-dark(rgba(0,0,0,0.1), rgba(255,255,255,0.25));' +
+  'color: #000000;' +
+  'color: light-dark(#000000, #ffffff);' +
+  'border-radius: 2px';
+const resetStyle = '';
+const pad = ' ';
+
+export function printToConsole(
+  methodName: string,
+  args: Array<any>,
+  badgeName: string,
+): void {
+  let offset = 0;
+  switch (methodName) {
+    case 'dir':
+    case 'dirxml':
+    case 'groupEnd':
+    case 'table': {
+      // These methods cannot be colorized because they don't take a formatting string.
+      // eslint-disable-next-line react-internal/no-production-logging
+      console[methodName].apply(console, args);
+      return;
+    }
+    case 'assert': {
+      // assert takes formatting options as the second argument.
+      offset = 1;
+    }
+  }
+
+  const newArgs = args.slice(0);
+  if (typeof newArgs[offset] === 'string') {
+    newArgs.splice(
+      offset,
+      1,
+      badgeFormat + newArgs[offset],
+      badgeStyle,
+      pad + badgeName + pad,
+      resetStyle,
+    );
+  } else {
+    newArgs.splice(
+      offset,
+      0,
+      badgeFormat,
+      badgeStyle,
+      pad + badgeName + pad,
+      resetStyle,
+    );
+  }
+
+  // eslint-disable-next-line react-internal/no-production-logging
+  console[methodName].apply(console, newArgs);
+  return;
+}
diff --git a/packages/react-client/src/ReactFlightClientConsoleConfigPlain.js b/packages/react-client/src/ReactFlightClientConsoleConfigPlain.js
new file mode 100644
index 0000000000000..1dbdec54cd078
--- /dev/null
+++ b/packages/react-client/src/ReactFlightClientConsoleConfigPlain.js
@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+const badgeFormat = '[%s] ';
+const pad = ' ';
+
+export function printToConsole(
+  methodName: string,
+  args: Array<any>,
+  badgeName: string,
+): void {
+  let offset = 0;
+  switch (methodName) {
+    case 'dir':
+    case 'dirxml':
+    case 'groupEnd':
+    case 'table': {
+      // These methods cannot be colorized because they don't take a formatting string.
+      // eslint-disable-next-line react-internal/no-production-logging
+      console[methodName].apply(console, args);
+      return;
+    }
+    case 'assert': {
+      // assert takes formatting options as the second argument.
+      offset = 1;
+    }
+  }
+
+  const newArgs = args.slice(0);
+  if (typeof newArgs[offset] === 'string') {
+    newArgs.splice(
+      offset,
+      1,
+      badgeFormat + newArgs[offset],
+      pad + badgeName + pad,
+    );
+  } else {
+    newArgs.splice(offset, 0, badgeFormat, pad + badgeName + pad);
+  }
+
+  // eslint-disable-next-line react-internal/no-production-logging
+  console[methodName].apply(console, newArgs);
+  return;
+}
diff --git a/packages/react-client/src/ReactFlightClientConsoleConfigServer.js b/packages/react-client/src/ReactFlightClientConsoleConfigServer.js
new file mode 100644
index 0000000000000..7567483245fa6
--- /dev/null
+++ b/packages/react-client/src/ReactFlightClientConsoleConfigServer.js
@@ -0,0 +1,70 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+// This flips color using ANSI, then sets a color styling, then resets.
+const badgeFormat = '\x1b[0m\x1b[7m%c%s\x1b[0m%c ';
+// Same badge styling as DevTools.
+const badgeStyle =
+  // We use a fixed background if light-dark is not supported, otherwise
+  // we use a transparent background.
+  'background: #e6e6e6;' +
+  'background: light-dark(rgba(0,0,0,0.1), rgba(255,255,255,0.25));' +
+  'color: #000000;' +
+  'color: light-dark(#000000, #ffffff);' +
+  'border-radius: 2px';
+const resetStyle = '';
+const pad = ' ';
+
+export function printToConsole(
+  methodName: string,
+  args: Array<any>,
+  badgeName: string,
+): void {
+  let offset = 0;
+  switch (methodName) {
+    case 'dir':
+    case 'dirxml':
+    case 'groupEnd':
+    case 'table': {
+      // These methods cannot be colorized because they don't take a formatting string.
+      // eslint-disable-next-line react-internal/no-production-logging
+      console[methodName].apply(console, args);
+      return;
+    }
+    case 'assert': {
+      // assert takes formatting options as the second argument.
+      offset = 1;
+    }
+  }
+
+  const newArgs = args.slice(0);
+  if (typeof newArgs[offset] === 'string') {
+    newArgs.splice(
+      offset,
+      1,
+      badgeFormat + newArgs[offset],
+      badgeStyle,
+      pad + badgeName + pad,
+      resetStyle,
+    );
+  } else {
+    newArgs.splice(
+      offset,
+      0,
+      badgeFormat,
+      badgeStyle,
+      pad + badgeName + pad,
+      resetStyle,
+    );
+  }
+
+  // eslint-disable-next-line react-internal/no-production-logging
+  console[methodName].apply(console, newArgs);
+  return;
+}
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.custom.js b/packages/react-client/src/forks/ReactFlightClientConfig.custom.js
index 152bfd8b1d51b..45a47a8c1405f 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.custom.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.custom.js
@@ -47,3 +47,5 @@ export opaque type StringDecoder = mixed; // eslint-disable-line no-undef
 export const createStringDecoder = $$$config.createStringDecoder;
 export const readPartialStringChunk = $$$config.readPartialStringChunk;
 export const readFinalStringChunk = $$$config.readFinalStringChunk;
+
+export const printToConsole = $$$config.printToConsole;
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-esm.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-esm.js
index 0a29f7eedf12a..87d87ea523e59 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-esm.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-esm.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigBrowser';
 export * from 'react-server-dom-esm/src/ReactFlightClientConfigBundlerESM';
 export * from 'react-server-dom-esm/src/ReactFlightClientConfigTargetESMBrowser';
 export * from 'react-dom-bindings/src/shared/ReactFlightClientConfigDOM';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-turbopack.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-turbopack.js
index 91803e317dda8..97b4afd13a835 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-turbopack.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser-turbopack.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigBrowser';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigBundlerTurbopack';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigBundlerTurbopackBrowser';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigTargetTurbopackBrowser';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser.js
index cd7c3fe534e6a..51c832bff43a3 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-browser.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigBrowser';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigBundlerWebpack';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigBundlerWebpackBrowser';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigTargetWebpackBrowser';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-bun.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-bun.js
index 09b0ba0dce9ef..50713ae8e8e68 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-bun.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-bun.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigPlain';
 export * from 'react-dom-bindings/src/shared/ReactFlightClientConfigDOM';
 
 export type Response = any;
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-turbopack.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-turbopack.js
index 47b8682cf605c..269f8ec0c2313 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-turbopack.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-turbopack.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigServer';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigBundlerTurbopack';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigBundlerTurbopackServer';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigTargetTurbopackServer';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-webpack.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-webpack.js
index 97205820b3e35..cafa02b686214 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-webpack.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-edge-webpack.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigServer';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigBundlerWebpack';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigBundlerWebpackServer';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigTargetWebpackServer';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-fb-experimental.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-fb-experimental.js
index 798c5035cc38f..7f43b0c2a3cd0 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-fb-experimental.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-fb-experimental.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigPlain';
 export * from 'react-dom-bindings/src/shared/ReactFlightClientConfigDOM';
 export * from 'react-server-dom-fb/src/ReactFlightClientConfigFBBundler';
 
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-legacy.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-legacy.js
index 09b0ba0dce9ef..017dc33081d5f 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-legacy.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-legacy.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigWeb';
+export * from 'react-client/src/ReactFlightClientConsoleConfigBrowser';
 export * from 'react-dom-bindings/src/shared/ReactFlightClientConfigDOM';
 
 export type Response = any;
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-esm.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-esm.js
index d18de1bd82750..6c68ae163bb51 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-esm.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-esm.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigNode';
+export * from 'react-client/src/ReactFlightClientConsoleConfigServer';
 export * from 'react-server-dom-esm/src/ReactFlightClientConfigBundlerESM';
 export * from 'react-server-dom-esm/src/ReactFlightClientConfigTargetESMServer';
 export * from 'react-dom-bindings/src/shared/ReactFlightClientConfigDOM';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack-bundled.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack-bundled.js
index e1ea79d9fa652..f1e7d66ee8117 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack-bundled.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack-bundled.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigNode';
+export * from 'react-client/src/ReactFlightClientConsoleConfigServer';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigBundlerTurbopack';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigBundlerTurbopackServer';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigTargetTurbopackServer';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack.js
index cb9b48e1928c8..c6da80ef6060f 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-turbopack.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigNode';
+export * from 'react-client/src/ReactFlightClientConsoleConfigServer';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigBundlerNode';
 export * from 'react-server-dom-turbopack/src/ReactFlightClientConfigTargetTurbopackServer';
 export * from 'react-dom-bindings/src/shared/ReactFlightClientConfigDOM';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-webpack.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-webpack.js
index 44713bccd756c..95fd1590ab5c6 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-webpack.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node-webpack.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigNode';
+export * from 'react-client/src/ReactFlightClientConsoleConfigServer';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigBundlerWebpack';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigBundlerWebpackServer';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigTargetWebpackServer';
diff --git a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node.js b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node.js
index 4000698372377..41c7e8e1d4706 100644
--- a/packages/react-client/src/forks/ReactFlightClientConfig.dom-node.js
+++ b/packages/react-client/src/forks/ReactFlightClientConfig.dom-node.js
@@ -8,6 +8,7 @@
  */
 
 export * from 'react-client/src/ReactFlightClientStreamConfigNode';
+export * from 'react-client/src/ReactFlightClientConsoleConfigServer';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigBundlerNode';
 export * from 'react-server-dom-webpack/src/ReactFlightClientConfigTargetWebpackServer';
 export * from 'react-dom-bindings/src/shared/ReactFlightClientConfigDOM';
diff --git a/packages/react-noop-renderer/src/ReactNoopFlightClient.js b/packages/react-noop-renderer/src/ReactNoopFlightClient.js
index 3bd3d863ac45e..afb3eb4760127 100644
--- a/packages/react-noop-renderer/src/ReactNoopFlightClient.js
+++ b/packages/react-noop-renderer/src/ReactNoopFlightClient.js
@@ -43,6 +43,10 @@ const {createResponse, processBinaryChunk, getRoot, close} = ReactFlightClient({
   parseModel(response: Response, json) {
     return JSON.parse(json, response._fromJSON);
   },
+  printToConsole(methodName, args, badgeName) {
+    // eslint-disable-next-line react-internal/no-production-logging
+    console[methodName].apply(console, args);
+  },
 });
 
 function read<T>(source: Source): Thenable<T> {
diff --git a/packages/react-server/src/ReactFlightServer.js b/packages/react-server/src/ReactFlightServer.js
index 4fd42da255c63..5f18f46d7ffe9 100644
--- a/packages/react-server/src/ReactFlightServer.js
+++ b/packages/react-server/src/ReactFlightServer.js
@@ -2213,7 +2213,9 @@ function emitConsoleChunk(
     }
   }
 
-  const payload = [methodName, stackTrace];
+  // TODO: Don't double badge if this log came from another Flight Client.
+  const env = request.environmentName;
+  const payload = [methodName, stackTrace, env];
   // $FlowFixMe[method-unbinding]
   payload.push.apply(payload, args);
   // $FlowFixMe[incompatible-type] stringify can return null
diff --git a/packages/shared/__tests__/normalizeConsoleFormat-test.internal.js b/packages/shared/__tests__/normalizeConsoleFormat-test.internal.js
new file mode 100644
index 0000000000000..e2cb4c7784704
--- /dev/null
+++ b/packages/shared/__tests__/normalizeConsoleFormat-test.internal.js
@@ -0,0 +1,51 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @emails react-core
+ */
+
+'use strict';
+
+let normalizeConsoleFormat;
+
+describe('normalizeConsoleFormat', () => {
+  beforeEach(() => {
+    normalizeConsoleFormat = require('shared/normalizeConsoleFormat').default;
+  });
+
+  it('normalize empty string', async () => {
+    expect(normalizeConsoleFormat('', [1, {}, 'foo'], 0)).toMatchInlineSnapshot(
+      `"%o %o %s"`,
+    );
+  });
+
+  it('normalize extra args', async () => {
+    expect(
+      normalizeConsoleFormat('%f', [1, {}, 'foo'], 0),
+    ).toMatchInlineSnapshot(`"%f %o %s"`);
+  });
+
+  it('normalize fewer than args', async () => {
+    expect(
+      normalizeConsoleFormat('%s %O %o %f', [1, {}, 'foo'], 0),
+    ).toMatchInlineSnapshot(`"%s %O %o %%f"`);
+  });
+
+  it('normalize escape sequences', async () => {
+    expect(
+      normalizeConsoleFormat('hel%lo %s %%s world', [1, 'foo'], 0),
+    ).toMatchInlineSnapshot(`"hel%lo %s %%s world %s"`);
+  });
+
+  it('normalize ending with escape', async () => {
+    expect(
+      normalizeConsoleFormat('hello %s world %', [1, {}, 'foo'], 0),
+    ).toMatchInlineSnapshot(`"hello %s world % %o %s"`);
+    expect(
+      normalizeConsoleFormat('hello %s world %', [], 0),
+    ).toMatchInlineSnapshot(`"hello %%s world %"`);
+  });
+});
diff --git a/packages/shared/normalizeConsoleFormat.js b/packages/shared/normalizeConsoleFormat.js
new file mode 100644
index 0000000000000..f224647425a0a
--- /dev/null
+++ b/packages/shared/normalizeConsoleFormat.js
@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+// Takes a format string (first argument to console) and returns a normalized
+// string that has the exact number of arguments as the args. That way it's safe
+// to prepend or append to it.
+export default function normalizeConsoleFormat(
+  formatString: string,
+  args: $ReadOnlyArray<mixed>,
+  firstArg: number,
+): string {
+  let j = firstArg;
+  let normalizedString = '';
+  let last = 0;
+  for (let i = 0; i < formatString.length - 1; i++) {
+    if (formatString.charCodeAt(i) !== 37 /* "%" */) {
+      continue;
+    }
+    switch (formatString.charCodeAt(++i)) {
+      case 79 /* "O" */:
+      case 99 /* "c" */:
+      case 100 /* "d" */:
+      case 102 /* "f" */:
+      case 105 /* "i" */:
+      case 111 /* "o" */:
+      case 115 /* "s" */: {
+        if (j < args.length) {
+          // We have a matching argument.
+          j++;
+        } else {
+          // We have more format specifiers than arguments.
+          // So we need to escape this to print the literal.
+          normalizedString += formatString.slice(last, (last = i)) + '%';
+        }
+      }
+    }
+  }
+  normalizedString += formatString.slice(last, formatString.length);
+  // Pad with extra format specifiers for the rest.
+  while (j < args.length) {
+    if (normalizedString !== '') {
+      normalizedString += ' ';
+    }
+    // Not every environment has the same default.
+    // This seems to be what Chrome DevTools defaults to.
+    normalizedString += typeof args[j] === 'string' ? '%s' : '%o';
+    j++;
+  }
+  return normalizedString;
+}