diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 577de41be06d..1e88cd491876 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -105,45 +105,6 @@ jobs:
       # `job_build` can't see `job_install_deps` and what it returned)
       dependency_cache_key: ${{ needs.job_install_deps.outputs.dependency_cache_key }}
 
-  # This isn't a full `yarn build` using sucrase - it's just the cache from the normal build, with `build/cjs` and
-  # `build/esm` overwritten by sucrase. This way we don't need to worry about all of the other random stuff which
-  # packages build, because it will already be there.
-  job_build_with_sucrase:
-    name: Sucrase Build
-    needs: [job_install_deps, job_build]
-    runs-on: ubuntu-latest
-    timeout-minutes: 20
-    steps:
-      - name: Check out current commit (${{ env.HEAD_COMMIT }})
-        uses: actions/checkout@v2
-        with:
-          ref: ${{ env.HEAD_COMMIT }}
-      - name: Set up Node
-        uses: actions/setup-node@v1
-      - name: Check dependency cache
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_install_deps.outputs.dependency_cache_key }}
-      - name: Check tsc build cache
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}
-      - name: Check sucrase build cache
-        uses: actions/cache@v2
-        id: cache_built_sucrase_packages
-        with:
-          path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
-      - name: Build packages with sucrase
-        if: steps.cache_built_sucrase_packages.outputs.cache-hit == ''
-        run: 'yarn build:rollup'
-    outputs:
-      # this needs to be passed on, because the `needs` context only looks at direct ancestors (so steps which depend on
-      # `job_build` can't see `job_install_deps` and what it returned)
-      dependency_cache_key: ${{ needs.job_install_deps.outputs.dependency_cache_key }}
-
   job_size_check:
     name: Size Check
     needs: job_build
@@ -295,6 +256,8 @@ jobs:
           NODE_VERSION: ${{ matrix.node }}
         run: |
           [[ $NODE_VERSION == 8 ]] && yarn add --dev --ignore-engines --ignore-scripts --ignore-workspace-root-check ts-node@8.x
+          # TODO remove this when we switch to sucrase
+          yarn ts-node scripts/sucrase-test-hack.ts
           yarn test-ci
       - name: Compute test coverage
         uses: codecov/codecov-action@v1
@@ -534,7 +497,7 @@ jobs:
 
   job_unit_test_sucrase:
     name: Sucrase Test (Node ${{ matrix.node }})
-    needs: job_build_with_sucrase
+    needs: job_build
     continue-on-error: true
     timeout-minutes: 30
     runs-on: ubuntu-latest
@@ -554,24 +517,26 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_build_with_sucrase.outputs.dependency_cache_key }}
+          key: ${{ needs.job_build.outputs.dependency_cache_key }}
       - name: Check build cache
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
+          key: ${{ env.BUILD_CACHE_KEY }}
       - name: Run tests
         env:
           NODE_VERSION: ${{ matrix.node }}
+          SUCRASE: true
         run: |
-          [[ $NODE_VERSION == 8 ]] && yarn add --dev --ignore-engines --ignore-scripts --ignore-workspace-root-check ts-node@8.x
+          [[ $NODE_VERSION == 8 ]] && yarn add --dev --ignore-engines --ignore-scripts --ignore-workspace-root-check ts-node@8.x rollup@2.2.0 @rollup/plugin-node-resolve@10.x rollup-plugin-terser@5.0.0 rollup-plugin-typescript2@0.30.0
+          yarn ts-node scripts/sucrase-test-hack.ts
           yarn test-ci
       - name: Compute test coverage
         uses: codecov/codecov-action@v1
 
   job_nextjs_integration_test_sucrase:
     name: Sucrase Test @sentry/nextjs on (Node ${{ matrix.node }})
-    needs: job_build_with_sucrase
+    needs: job_build
     continue-on-error: true
     timeout-minutes: 30
     runs-on: ubuntu-latest
@@ -591,16 +556,17 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_build_with_sucrase.outputs.dependency_cache_key }}
+          key: ${{ needs.job_build.outputs.dependency_cache_key }}
       - name: Check build cache
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
+          key: ${{ env.BUILD_CACHE_KEY }}
       - name: Run tests
         env:
           NODE_VERSION: ${{ matrix.node }}
         run: |
+          yarn ts-node scripts/sucrase-test-hack.ts
           cd packages/nextjs
           yarn test:integration
 
@@ -608,7 +574,7 @@ jobs:
   # separate job allows them to run in parallel with the other tests.
   job_ember_tests_sucrase:
     name: Sucrase Test @sentry/ember
-    needs: job_build_with_sucrase
+    needs: job_build
     continue-on-error: true
     timeout-minutes: 30
     runs-on: ubuntu-latest
@@ -634,20 +600,22 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_build_with_sucrase.outputs.dependency_cache_key }}
+          key: ${{ needs.job_build.outputs.dependency_cache_key }}
       - name: Check build cache
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
+          key: ${{ env.BUILD_CACHE_KEY }}
       - name: Run Ember tests
-        run: yarn test --scope=@sentry/ember
+        run: |
+          yarn ts-node scripts/sucrase-test-hack.ts
+          yarn test --scope=@sentry/ember
       - name: Compute test coverage
         uses: codecov/codecov-action@v1
 
   job_browser_playwright_tests_sucrase:
     name: Sucrase Playwright - ${{ (matrix.tracing_only && 'Browser + Tracing') || 'Browser' }} (${{ matrix.bundle }})
-    needs: job_build_with_sucrase
+    needs: job_build
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -677,24 +645,25 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_build_with_sucrase.outputs.dependency_cache_key }}
+          key: ${{ needs.job_build.outputs.dependency_cache_key }}
       - name: Check build cache
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
+          key: ${{ env.BUILD_CACHE_KEY }}
       - name: Run Playwright tests
         env:
           PW_BUNDLE: ${{ matrix.bundle }}
           PW_TRACING_ONLY: ${{ matrix.tracing_only }}
         run: |
+          yarn ts-node scripts/sucrase-test-hack.ts
           cd packages/integration-tests
           yarn run playwright install-deps webkit
           yarn test:ci
 
   job_browser_integration_tests_sucrase:
     name: Sucrase Old Browser Integration Tests (${{ matrix.browser }})
-    needs: job_build_with_sucrase
+    needs: job_build
     runs-on: ubuntu-latest
     timeout-minutes: 10
     continue-on-error: true
@@ -715,23 +684,24 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_build_with_sucrase.outputs.dependency_cache_key }}
+          key: ${{ needs.job_build.outputs.dependency_cache_key }}
       - name: Check build cache
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
+          key: ${{ env.BUILD_CACHE_KEY }}
       - name: Run integration tests
         env:
           KARMA_BROWSER: ${{ matrix.browser }}
         run: |
+          yarn ts-node scripts/sucrase-test-hack.ts
           cd packages/browser
           [[ $KARMA_BROWSER == WebkitHeadless ]] && yarn run playwright install-deps webkit
           yarn test:integration
 
   job_browser_build_tests_sucrase:
     name: Sucrase Browser Build Tests
-    needs: job_build_with_sucrase
+    needs: job_build
     runs-on: ubuntu-latest
     timeout-minutes: 5
     continue-on-error: true
@@ -748,14 +718,15 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_build_with_sucrase.outputs.dependency_cache_key }}
+          key: ${{ needs.job_build.outputs.dependency_cache_key }}
       - name: Check build cache
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
+          key: ${{ env.BUILD_CACHE_KEY }}
       - name: Run browser build tests
         run: |
+          yarn ts-node scripts/sucrase-test-hack.ts
           cd packages/browser
           yarn test:package
       - name: Run utils build tests
@@ -765,7 +736,7 @@ jobs:
 
   job_node_integration_tests_sucrase:
     name: Sucrase Node SDK Integration Tests (${{ matrix.node }})
-    needs: job_build_with_sucrase
+    needs: job_build
     runs-on: ubuntu-latest
     timeout-minutes: 10
     continue-on-error: true
@@ -785,15 +756,16 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_DEPENDENCY_PATHS }}
-          key: ${{ needs.job_build_with_sucrase.outputs.dependency_cache_key }}
+          key: ${{ needs.job_build.outputs.dependency_cache_key }}
       - name: Check build cache
         uses: actions/cache@v2
         with:
           path: ${{ env.CACHED_BUILD_PATHS }}
-          key: ${{ env.BUILD_CACHE_KEY }}-sucrase
+          key: ${{ env.BUILD_CACHE_KEY }}
       - name: Run integration tests
         env:
           NODE_VERSION: ${{ matrix.node }}
         run: |
+          yarn ts-node scripts/sucrase-test-hack.ts
           cd packages/node-integration-tests
           yarn test
diff --git a/rollup/npmHelpers.js b/rollup/npmHelpers.js
index b4397a56f466..71bdc58fb953 100644
--- a/rollup/npmHelpers.js
+++ b/rollup/npmHelpers.js
@@ -22,7 +22,8 @@ export function makeBaseNPMConfig(options = {}) {
   const nodeResolvePlugin = makeNodeResolvePlugin();
   const sucrasePlugin = makeSucrasePlugin();
 
-  return {
+  // return {
+  const config = {
     input: entrypoints,
 
     output: {
@@ -32,10 +33,10 @@ export function makeBaseNPMConfig(options = {}) {
       sourcemap: true,
 
       // output individual files rather than one big bundle
-      preserveModules: true,
+      // preserveModules: true,
 
       // any wrappers or helper functions generated by rollup can use ES6 features
-      generatedCode: 'es2015',
+      // generatedCode: 'es2015',
 
       // don't add `"use strict"` to the top of cjs files
       strict: false,
@@ -78,6 +79,17 @@ export function makeBaseNPMConfig(options = {}) {
     // treeshake: 'smallest',
     treeshake: false,
   };
+
+  // temporary hack for testing sucrase bundles before we switch over
+  if (!process.version.startsWith('v8')) {
+    console.log('Doing normal preserveModules');
+    config.output.preserveModules = true;
+  } else {
+    console.log('Doing node 8 preserveModules');
+    config.preserveModules = true;
+  }
+
+  return config;
 }
 
 export function makeNPMConfigVariants(baseConfig) {
diff --git a/scripts/sucrase-test-hack.ts b/scripts/sucrase-test-hack.ts
new file mode 100644
index 000000000000..e697145abbdb
--- /dev/null
+++ b/scripts/sucrase-test-hack.ts
@@ -0,0 +1,49 @@
+// A temporary hack to use sucrase versions of packages for testing in CI.
+
+import * as childProcess from 'child_process';
+import * as fs from 'fs';
+import * as path from 'path';
+
+function run(cmd: string, options?: childProcess.ExecSyncOptions): unknown {
+  return childProcess.execSync(cmd, { stdio: 'inherit', ...options });
+}
+
+const ignorePackages = process.version.startsWith('v8')
+  ? [
+      '@sentry/ember',
+      '@sentry-internal/eslint-plugin-sdk',
+      '@sentry/react',
+      '@sentry/wasm',
+      '@sentry/gatsby',
+      '@sentry/serverless',
+      '@sentry/nextjs',
+      '@sentry/angular',
+    ]
+  : ['@sentry/serverless'];
+
+// clear current builds and rebuild with rollup/sucrase (this way, all of the extra, random stuff which gets built in
+// the main build job remains, and only the part affected by this project gets overwritten)
+if (process.env.SUCRASE) {
+  // just to be super sure
+  fs.readdirSync(path.join(process.cwd(), 'packages')).forEach(dir => {
+    if (fs.existsSync(path.join(process.cwd(), 'packages', dir, 'build', 'npm'))) {
+      run(`rm -rf packages/${dir}/build/npm/cjs`);
+      run(`rm -rf packages/${dir}/build/npm/esm`);
+    } else if (fs.existsSync(path.join(process.cwd(), 'packages', dir, 'build', 'cjs'))) {
+      run(`rm -rf packages/${dir}/build/cjs`);
+      run(`rm -rf packages/${dir}/build/esm`);
+    }
+  });
+
+  // rebuild the packages we're going to test with rollup/sucrase
+  run(`yarn build:rollup ${ignorePackages.map(dep => `--ignore="${dep}"`).join(' ')}`);
+}
+// if we're in tsc-land, rebuild using es5 - temporary until switch to sucrase
+else {
+  const baseTSConfigPath = 'packages/typescript/tsconfig.json';
+  fs.writeFileSync(
+    baseTSConfigPath,
+    String(fs.readFileSync(baseTSConfigPath)).replace('"target": "es6"', '"target": "es5"'),
+  );
+  run(`yarn build:dev ${ignorePackages.map(dep => `--ignore="${dep}"`).join(' ')}`);
+}
diff --git a/scripts/test.ts b/scripts/test.ts
index ca33e54ee3d0..1232d9f0d104 100644
--- a/scripts/test.ts
+++ b/scripts/test.ts
@@ -1,5 +1,4 @@
 import { spawnSync } from 'child_process';
-import * as fs from 'fs';
 import { join } from 'path';
 
 function run(cmd: string, cwd: string = '') {
@@ -48,12 +47,6 @@ if (nodeMajorVersion <= 10) {
     // against a single version of node, but in the short run, this at least allows us to not be blocked by the
     // failures.)
     run('rm -rf packages/tracing/test/browser');
-
-    // TODO Pull this out once we switch to sucrase builds
-    // Recompile as es5, so as not to have to fix a compatibility problem that will soon be moot
-    const baseTSConfig = 'packages/typescript/tsconfig.json';
-    fs.writeFileSync(baseTSConfig, String(fs.readFileSync(baseTSConfig)).replace('"target": "es6"', '"target": "es5"'));
-    run(`yarn build:dev ${ignorePackages.map(dep => `--ignore="${dep}"`).join(' ')}`);
   }
   // Node 10
   else {