chore: aligning target for esm build with core repo (open-telemetry#557)

Author: obecny

plugins/web/opentelemetry-instrumentation-document-load/src/instrumentation.ts

@@ -90,7 +90,7 @@ export class DocumentLoadInstrumentation extends InstrumentationBase<unknown> {
    * Collects information about performance and creates appropriate spans
    */
   private _collectPerformance() {
-    const metaElement = [...document.getElementsByTagName('meta')].find(
+    const metaElement = Array.from(document.getElementsByTagName('meta')).find(
       e => e.getAttribute('name') === TRACE_PARENT_HEADER
     );
     const entries = getPerformanceNavigationEntries();

tsconfig.base.esm.json

@@ -1,5 +1,5 @@
 {
-  "extends": "./tsconfig.base.json",
+  "extends": "./tsconfig.es5.json",
   "compilerOptions": {
     "module": "ES6",
     "moduleResolution": "node"

tsconfig.es5.json

@@ -0,0 +1,6 @@
+{
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "target": "es5"
+  }
+}