diff --git a/.swcrc b/.swcrc
new file mode 100644
index 00000000000..7f1317d0f30
--- /dev/null
+++ b/.swcrc
@@ -0,0 +1,10 @@
+{
+    "$schema": "https://json.schemastore.org/swcrc",
+    "jsc": {
+        "transform": {
+            "react": { "runtime": "automatic" }
+        },
+        "parser": { "syntax": "typescript" },
+        "target": "es2022"
+    }
+}
diff --git a/BUILD.bazel b/BUILD.bazel
index 8caaa6d84f3..9c22ead4c4e 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -337,4 +337,5 @@ exports_files([
     # Used for when copy_to_directory might reference an empty filegroup
     # under certain conditions. See //ui/assets/...
     "CONTRIBUTING.md",
+    ".swcrc",
 ])
diff --git a/WORKSPACE b/WORKSPACE
index ae70f527866..4f91499a1b2 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -49,6 +49,13 @@ http_archive(
     url = "https://github.com/aspect-build/rules_jest/archive/95d8f1961a9c6f3aee2929881b1b74461652e775.tar.gz",
 )
 
+http_archive(
+    name = "aspect_rules_swc",
+    sha256 = "8eb9e42ed166f20cacedfdb22d8d5b31156352eac190fc3347db55603745a2d8",
+    strip_prefix = "rules_swc-1.1.0",
+    url = "https://github.com/aspect-build/rules_swc/releases/download/v1.1.0/rules_swc-v1.1.0.tar.gz",
+)
+
 http_archive(
     name = "io_bazel_rules_go",
     sha256 = "51dc53293afe317d2696d4d6433a4c33feedb7748a9e352072e2ec3c0dafd2c6",
@@ -206,12 +213,24 @@ load("@jest//:npm_repositories.bzl", jest_npm_repositories = "npm_repositories")
 
 jest_npm_repositories()
 
+# rules_swc setup ==============================
+load("@aspect_rules_swc//swc:dependencies.bzl", "rules_swc_dependencies")
+
+rules_swc_dependencies()
+
+load("@aspect_rules_swc//swc:repositories.bzl", "LATEST_SWC_VERSION", "swc_register_toolchains")
+
+swc_register_toolchains(
+    name = "swc",
+    swc_version = LATEST_SWC_VERSION,
+)
+
 # rules_esbuild setup ===========================
 http_archive(
     name = "aspect_rules_esbuild",
-    sha256 = "2ea31bd97181a315e048be693ddc2815fddda0f3a12ca7b7cc6e91e80f31bac7",
-    strip_prefix = "rules_esbuild-0.14.4",
-    url = "https://github.com/aspect-build/rules_esbuild/releases/download/v0.14.4/rules_esbuild-v0.14.4.tar.gz",
+    sha256 = "84419868e43c714c0d909dca73039e2f25427fc04f352d2f4f7343ca33f60deb",
+    strip_prefix = "rules_esbuild-0.15.3",
+    url = "https://github.com/aspect-build/rules_esbuild/releases/download/v0.15.3/rules_esbuild-v0.15.3.tar.gz",
 )
 
 load("@aspect_rules_esbuild//esbuild:dependencies.bzl", "rules_esbuild_dependencies")
@@ -219,11 +238,11 @@ load("@aspect_rules_esbuild//esbuild:dependencies.bzl", "rules_esbuild_dependenc
 rules_esbuild_dependencies()
 
 # Register a toolchain containing esbuild npm package and native bindings
-load("@aspect_rules_esbuild//esbuild:repositories.bzl", "LATEST_VERSION", "esbuild_register_toolchains")
+load("@aspect_rules_esbuild//esbuild:repositories.bzl", "LATEST_ESBUILD_VERSION", "esbuild_register_toolchains")
 
 esbuild_register_toolchains(
     name = "esbuild",
-    esbuild_version = LATEST_VERSION,
+    esbuild_version = LATEST_ESBUILD_VERSION,
 )
 
 # Go toolchain setup
diff --git a/client/browser/BUILD.bazel b/client/browser/BUILD.bazel
index e85b75ac981..637b62ed490 100644
--- a/client/browser/BUILD.bazel
+++ b/client/browser/BUILD.bazel
@@ -381,7 +381,7 @@ esbuild(
         # STATIC ASSETS
         "//client/browser/assets",
     ],
-    config = "//client/browser/config:esbuild-config",
+    config = "//client/browser/config:esbuild-config_bundle",
     entry_points = [
         "src/browser-extension/scripts/backgroundPage.main.js",
         "src/browser-extension/scripts/contentPage.main.js",
diff --git a/client/browser/config/BUILD.bazel b/client/browser/config/BUILD.bazel
index 3c170ae9cd2..51c2117ebec 100644
--- a/client/browser/config/BUILD.bazel
+++ b/client/browser/config/BUILD.bazel
@@ -1,4 +1,5 @@
 load("//dev:defs.bzl", "ts_project")
+load("@aspect_rules_esbuild//esbuild:defs.bzl", "esbuild")
 load("@aspect_rules_js//js:defs.bzl", "js_library")
 
 # config/ does not contain a src/
@@ -33,10 +34,41 @@ ts_project(
 js_library(
     name = "esbuild-config",
     srcs = ["esbuild.bazel.js"],
-    visibility = ["//client:__subpackages__"],
     deps = [
         "//client/browser:node_modules/@sourcegraph/build-config",
         "//client/browser/config",
         "//client/build-config:build-config_lib",
     ],
 )
+
+esbuild(
+    name = "esbuild-config_bundle",
+    srcs = [
+        ":esbuild-config",
+    ],
+    entry_point = "esbuild.bazel.js",
+    external = [
+        "fsevents",
+        "pnpapi",
+        "../../../../postcss.config",
+
+        # suppress esbuild require-resolve-not-external warnings
+        "esbuild",
+        "path-browserify",
+        "monaco-yaml/lib/esm/monaco.contribution",
+        "monaco-yaml/lib/esm/yaml.worker",
+        "rxjs/_esm5/internal/OuterSubscriber",
+        "rxjs/_esm5/internal/util/subscribeToResult",
+        "rxjs/_esm5/internal/util/subscribeToArray",
+        "rxjs/_esm5/internal/Observable",
+    ],
+    format = "cjs",
+    platform = "node",
+    sourcemap = False,
+    splitting = False,
+    target = "es2022",
+    visibility = ["//client:__subpackages__"],
+    deps = [
+        "//:postcss_config_js",
+    ],
+)
diff --git a/client/browser/src/types/webextension-polyfill/index.d.ts b/client/browser/src/types/webextension-polyfill/index.d.ts
index 49377d42c00..7400dc5eed8 100644
--- a/client/browser/src/types/webextension-polyfill/index.d.ts
+++ b/client/browser/src/types/webextension-polyfill/index.d.ts
@@ -430,10 +430,6 @@ declare namespace browser.contentScripts {
 declare namespace browser.devtools.inspectedWindow {
     const tabId: number
 
-    function eval(
-        expression: string
-    ): Promise<[any, { isException: boolean; value: string } | { isError: boolean; code: string }]>
-
     function reload(reloadOptions?: { ignoreCache?: boolean; userAgent?: string; injectedScript?: string }): void
 }
 
diff --git a/client/build-config/BUILD.bazel b/client/build-config/BUILD.bazel
index 16ae49847b4..19d2ea9b45d 100644
--- a/client/build-config/BUILD.bazel
+++ b/client/build-config/BUILD.bazel
@@ -35,7 +35,6 @@ ts_project(
     data = [
         "//:postcss_config_js",  #keep
     ],
-    module = "commonjs",
     tsconfig = ":tsconfig",
     deps = [
         ":node_modules/@types/sass",
diff --git a/client/shared/src/testing/BUILD.bazel b/client/shared/src/testing/BUILD.bazel
index 34ab4456017..f1eca14ea99 100644
--- a/client/shared/src/testing/BUILD.bazel
+++ b/client/shared/src/testing/BUILD.bazel
@@ -57,7 +57,6 @@ ts_project(
         "utils.ts",
     ],
     tsconfig = "//client/shared:tsconfig",
-    use_preset_env = False,
     deps = [
         "//:node_modules/@apollo/client",
         "//:node_modules/@axe-core/puppeteer",
diff --git a/client/shared/src/testing/integration/polly/CdpAdapter.ts b/client/shared/src/testing/integration/polly/CdpAdapter.ts
index 2e5658807aa..ea9568740fc 100644
--- a/client/shared/src/testing/integration/polly/CdpAdapter.ts
+++ b/client/shared/src/testing/integration/polly/CdpAdapter.ts
@@ -58,8 +58,11 @@ export class CdpAdapter extends PollyAdapter {
 
     /**
      * `adapterOptions` passed to Polly.
+     *
+     * Uses `declare` because otherwise esbuild overwrites the superclass PollyAdapter's `options`
+     * field. See https://github.com/evanw/esbuild/issues/885.
      */
-    public options!: CdpAdapterOptions
+    public declare options: CdpAdapterOptions
 
     private readonly _errors = new Subject<unknown>()
 
diff --git a/client/web/BUILD.bazel b/client/web/BUILD.bazel
index 104ced4304b..5a1547625a1 100644
--- a/client/web/BUILD.bazel
+++ b/client/web/BUILD.bazel
@@ -2120,7 +2120,7 @@ BUNDLE_DATA_DEPS = [
     # TODO(bazel): this is already in the main ts_project(srcs). Why also here?
     "src/enterprise/codeintel/configuration/schema.json",
     ":enterprise-yaml",
-    "//client/web/dev:esbuild-config-production",
+    "//client/web/dev:esbuild-config-production_bundle",
 ]
 
 esbuild(
@@ -2129,7 +2129,7 @@ esbuild(
         ":web_lib",
         "//:package_json",
     ],
-    config = "//client/web/dev:esbuild-config-production",
+    config = "//client/web/dev:esbuild-config-production_bundle",
     entry_points = [
         "src/enterprise/main.js",
         "src/enterprise/embed/embedMain.js",
@@ -2148,7 +2148,7 @@ esbuild_web_app(
         ":web_lib",
         "//:package_json",
     ],
-    config = "//client/web/dev:esbuild-config-production",
+    config = "//client/web/dev:esbuild-config-production_bundle",
     define = {
         "process.env.INTEGRATION_TESTS": "true",
     },
@@ -2156,6 +2156,7 @@ esbuild_web_app(
         "src/enterprise/main.js",
         "src/enterprise/embed/embedMain.js",
     ],
+    sourcemap = "linked",
     visibility = ["//visibility:public"],
     deps = ESBUILD_CONFIG_DEPS,
 )
diff --git a/client/web/dev/BUILD.bazel b/client/web/dev/BUILD.bazel
index 331e8f6375a..04db2391132 100644
--- a/client/web/dev/BUILD.bazel
+++ b/client/web/dev/BUILD.bazel
@@ -1,3 +1,4 @@
+load("@aspect_rules_esbuild//esbuild:defs.bzl", "esbuild")
 load("@aspect_rules_js//js:defs.bzl", "js_library")
 load("@aspect_rules_ts//ts:defs.bzl", "ts_config")
 load("//dev:defs.bzl", "ts_project")
@@ -36,7 +37,6 @@ ts_project(
         "utils/should-compress-response.ts",
         "utils/success-banner.ts",
     ],
-    module = "commonjs",
     tsconfig = ":tsconfig",
     visibility = ["//client/web:__subpackages__"],
     deps = [
@@ -66,10 +66,41 @@ ts_project(
 js_library(
     name = "esbuild-config-production",
     srcs = ["esbuild/bazel/esbuild.bazel.production.js"],
-    visibility = ["//client:__subpackages__"],
     deps = [
         "//client/build-config:build-config_lib",
         "//client/web:node_modules/@sourcegraph/build-config",
         "//client/web/dev",
     ],
 )
+
+esbuild(
+    name = "esbuild-config-production_bundle",
+    srcs = [
+        ":esbuild-config-production",
+    ],
+    entry_point = "esbuild/bazel/esbuild.bazel.production.js",
+    external = [
+        "fsevents",
+        "pnpapi",
+        "../../../../postcss.config",
+
+        # suppress esbuild require-resolve-not-external warnings
+        "esbuild",
+        "path-browserify",
+        "monaco-yaml/lib/esm/monaco.contribution",
+        "monaco-yaml/lib/esm/yaml.worker",
+        "rxjs/_esm5/internal/OuterSubscriber",
+        "rxjs/_esm5/internal/util/subscribeToResult",
+        "rxjs/_esm5/internal/util/subscribeToArray",
+        "rxjs/_esm5/internal/Observable",
+    ],
+    format = "cjs",
+    platform = "node",
+    sourcemap = False,
+    splitting = False,
+    target = "es2022",
+    visibility = ["//client:__subpackages__"],
+    deps = [
+        "//:postcss_config_js",
+    ],
+)
diff --git a/client/web/scripts/BUILD.bazel b/client/web/scripts/BUILD.bazel
index c2fea2ccee0..7a29f664976 100644
--- a/client/web/scripts/BUILD.bazel
+++ b/client/web/scripts/BUILD.bazel
@@ -6,7 +6,6 @@ ts_project(
     srcs = [
         "report-bundle-diff.ts",
     ],
-    module = "commonjs",
     tsconfig = "//client/web:tsconfig",
     deps = [
         "//:node_modules/@types/shelljs",
diff --git a/client/web/src/end-to-end/BUILD.bazel b/client/web/src/end-to-end/BUILD.bazel
index 92cd1eed2b3..1c27b03869f 100644
--- a/client/web/src/end-to-end/BUILD.bazel
+++ b/client/web/src/end-to-end/BUILD.bazel
@@ -25,7 +25,6 @@ ts_project(
         "utils/initEndToEndTest.ts",
     ],
     tsconfig = ":tsconfig",
-    use_preset_env = False,
     deps = [
         "//:node_modules/@types/mocha",
         "//:node_modules/@types/mockdate",
@@ -44,7 +43,6 @@ ts_project(
         "frontend-platform/theme-switcher.test.ts",
     ],
     tsconfig = ":tsconfig",
-    use_preset_env = False,
     deps = [
         ":end-to-end",
         "//:node_modules/@types/lodash",
diff --git a/client/web/src/integration/BUILD.bazel b/client/web/src/integration/BUILD.bazel
index 0a730c4b2ec..d99832d8e85 100644
--- a/client/web/src/integration/BUILD.bazel
+++ b/client/web/src/integration/BUILD.bazel
@@ -28,7 +28,6 @@ ts_project(
         "temporarySettingsContext.ts",
         "utils.ts",
     ],
-    module = "commonjs",
     tsconfig = ":tsconfig",
     deps = [
         "//:node_modules/@codemirror/view",
@@ -84,7 +83,6 @@ ts_project(
         "sign-in.test.ts",
     ],
     tsconfig = ":tsconfig",
-    use_preset_env = False,
     deps = [
         ":integration",
         "//:node_modules/@types/lodash",
diff --git a/dev/babel.bzl b/dev/babel.bzl
deleted file mode 100644
index cc185d60d5d..00000000000
--- a/dev/babel.bzl
+++ /dev/null
@@ -1,95 +0,0 @@
-"Babel rule"
-
-load("@aspect_rules_js//js:defs.bzl", "js_library")
-load("@npm//:@babel/cli/package_json.bzl", "bin")
-
-def babel(name, srcs, module = None, use_preset_env = True, **kwargs):
-    """A wrapper around Babel CLI
-
-    Args:
-        name: A unique name for this target
-
-        srcs: A list of sources
-
-        module: If specified, sets BABEL_MODULE environment variable to this value
-
-        use_preset_env: Controls if we transpile TS sources with babel-preset-env.
-        If set to False, sets the DISABLE_PRESET_ENV environment variable to "true".
-
-        **kwargs: Additional arguments to pass to the rule
-    """
-
-    # rules_js runs in the execroot under the output tree in bazel-out/[arch]/bin
-    execroot = "../../.."
-
-    visibility = kwargs.pop("visibility", ["//visibility:public"])
-    source_map = kwargs.pop("source_map", True)
-
-    ts_srcs = []
-    outs = []
-    data = kwargs.pop("data", [])
-    deps = kwargs.pop("deps", [])
-
-    # Collect the srcs to compile and expected outputs
-    for src in srcs:
-        # JSON does not need to be compiled
-        if src.endswith(".json"):
-            data.append(src)
-            continue
-
-        # dts are only for type-checking and not to be compiled
-        if src.endswith(".d.ts"):
-            continue
-
-        if not (src.endswith(".ts") or src.endswith(".tsx")):
-            fail("babel example transpiler only supports source .ts[x] files, got: %s" % src)
-
-        ts_srcs.append(src)
-
-        # Predict the output paths where babel will write
-        js_out = src.replace(".tsx", ".js").replace(".ts", ".js")
-
-        outs.append(js_out)
-        if source_map:
-            outs.append(js_out + ".map")
-
-    # see https://babeljs.io/docs/en/babel-cli
-    args = [
-        native.package_name(),
-        "--config-file",
-        "{}/$(location {})".format(execroot, "//:babel_config"),
-        "--source-maps",
-        "true" if source_map else "false",
-        "--extensions",
-        ".ts,.tsx",
-        "--out-dir",
-        "{}/{}".format(".", native.package_name()),
-    ]
-
-    env = {}
-    if module != None:
-        env["BABEL_MODULE"] = module
-
-    if use_preset_env == False:
-        env["DISABLE_PRESET_ENV"] = "true"
-
-    bin.babel(
-        name = "{}_lib".format(name),
-        progress_message = "Compiling {}:{}".format(native.package_name(), name),
-        srcs = ts_srcs + [
-            "//:babel_config",
-            "//:package_json",
-        ],
-        outs = outs,
-        args = args,
-        env = env,
-        **kwargs
-    )
-
-    js_library(
-        name = name,
-        srcs = outs,
-        deps = deps,
-        data = data,
-        visibility = visibility,
-    )
diff --git a/dev/defs.bzl b/dev/defs.bzl
index 17ac8d8f93b..1cba01e286c 100644
--- a/dev/defs.bzl
+++ b/dev/defs.bzl
@@ -1,5 +1,6 @@
 "Bazel rules"
 
+load("@aspect_rules_swc//swc:defs.bzl", "swc")
 load("@bazel_skylib//lib:partial.bzl", "partial")
 load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
 load("@aspect_rules_js//npm:defs.bzl", _npm_package = "npm_package")
@@ -8,12 +9,11 @@ load("@aspect_rules_jest//jest:defs.bzl", _jest_test = "jest_test")
 load("@aspect_rules_js//js:defs.bzl", "js_binary")
 load("//dev:eslint.bzl", "eslint_test_with_types", "get_client_package_path")
 load(":sass.bzl", _sass = "sass")
-load(":babel.bzl", _babel = "babel")
 
 sass = _sass
 
 # TODO move this to `ts_project.bzl`
-def ts_project(name, srcs = [], deps = [], use_preset_env = True, **kwargs):
+def ts_project(name, srcs = [], deps = [], module = "es6", **kwargs):
     """A wrapper around ts_project
 
     Args:
@@ -23,7 +23,7 @@ def ts_project(name, srcs = [], deps = [], use_preset_env = True, **kwargs):
 
         deps: A list of dependencies
 
-        use_preset_env: Controls if we transpile TS sources with babel-preset-env
+        module: The module type to use for the project (es6 or commonjs)
 
         **kwargs: Additional arguments to pass to ts_project
     """
@@ -43,18 +43,27 @@ def ts_project(name, srcs = [], deps = [], use_preset_env = True, **kwargs):
     visibility = kwargs.pop("visibility", ["//visibility:public"])
 
     # Add standard test libraries for the repo test frameworks
-    if kwargs.get("testonly", False):
+    testonly = kwargs.get("testonly", False)
+    if testonly:
         deps = deps + [d for d in [
             "//:node_modules/@jest/globals",
             "//:node_modules/@types/mocha",
             "//:node_modules/@jest/expect",
         ] if not d in deps]
 
+    transpiler = partial.make(
+        swc,
+        swcrc = kwargs.pop("swcrc", "//:.swcrc"),
+        # Test code using jest.mock needs to be transpiled to CommonJS.
+        args = ["--config-json", '{"module": {"type": "commonjs"}}'] if module == "commonjs" else [],
+    )
+
     # Default arguments for ts_project.
     _ts_project(
         name = name,
         srcs = srcs,
         deps = deps,
+        transpiler = transpiler,
 
         # tsconfig options, default to the root
         tsconfig = kwargs.pop("tsconfig", "//:tsconfig"),
@@ -65,16 +74,6 @@ def ts_project(name, srcs = [], deps = [], use_preset_env = True, **kwargs):
         source_map = kwargs.pop("source_map", True),
         preserve_jsx = kwargs.pop("preserve_jsx", None),
         visibility = visibility,
-
-        # use babel as the transpiler
-        transpiler = partial.make(
-            _babel,
-            use_preset_env = use_preset_env,
-            module = kwargs.pop("module", None),
-            tags = kwargs.get("tags", []),
-            visibility = visibility,
-            testonly = kwargs.get("testonly", None),
-        ),
         supports_workers = 0,
 
         # Allow any other args
diff --git a/dev/mocha.bzl b/dev/mocha.bzl
index 8f508ae9f76..c493579f232 100644
--- a/dev/mocha.bzl
+++ b/dev/mocha.bzl
@@ -18,9 +18,6 @@ NON_BUNDLED = [
     # UMD modules
     "jsonc-parser",
 
-    # Dependencies with bundling issues
-    "@sourcegraph/build-config",
-
     # Used by require.resolve
     "axe-core",
 ]
@@ -31,7 +28,6 @@ NON_BUNDLED_DEPS = [
     "//:node_modules/puppeteer",
     "//:node_modules/@axe-core/puppeteer",
     "//:node_modules/axe-core",
-    "//client/web:node_modules/@sourcegraph/build-config",
 ]
 
 def mocha_test(name, tests, deps = [], args = [], data = [], env = {}, is_percy_enabled = False, **kwargs):