diff --git a/.gitignore b/.gitignore
index 5340fa68..1bd073c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,7 +8,7 @@ yarn-error.log*
 # Generated files
 *.d.ts
 index.js
-lib
+/lib
 
 # Runtime data
 pids
diff --git a/src/lib/bindings/http/emitter_binary.js b/src/lib/bindings/http/emitter_binary.js
index bd9781b1..ab9288ce 100644
--- a/src/lib/bindings/http/emitter_binary.js
+++ b/src/lib/bindings/http/emitter_binary.js
@@ -11,7 +11,7 @@ const {
   DATA_ATTRIBUTE,
   SPEC_V1,
   SPEC_V03
-} = require("./constants.js");
+} = require("./constants");
 
 const defaults = {
   [HEADERS]: {
diff --git a/src/lib/bindings/http/emitter_structured.js b/src/lib/bindings/http/emitter_structured.js
index 7b237693..6a76a51d 100644
--- a/src/lib/bindings/http/emitter_structured.js
+++ b/src/lib/bindings/http/emitter_structured.js
@@ -7,7 +7,7 @@ const {
   DEFAULT_CE_CONTENT_TYPE,
   HEADERS,
   HEADER_CONTENT_TYPE
-} = require("./constants.js");
+} = require("./constants");
 
 const defaults = {
   [HEADERS]: {
diff --git a/src/lib/bindings/http/receiver_binary.js b/src/lib/bindings/http/receiver_binary.js
index 664e3fec..64a54818 100644
--- a/src/lib/bindings/http/receiver_binary.js
+++ b/src/lib/bindings/http/receiver_binary.js
@@ -1,7 +1,7 @@
 const ReceiverV1 = require("./v1/receiver_binary_1.js");
 const ReceiverV3 = require("./v03/receiver_binary_0_3.js");
 
-const { SPEC_V03, SPEC_V1 } = require("./constants.js");
+const { SPEC_V03, SPEC_V1 } = require("./constants");
 const { check, parse } = require("./validation/binary.js");
 
 /** @typedef {import("../../cloudevent")} CloudEvent */
diff --git a/src/lib/bindings/http/receiver_structured.js b/src/lib/bindings/http/receiver_structured.js
index 2d8f7d9b..70a0c5e1 100644
--- a/src/lib/bindings/http/receiver_structured.js
+++ b/src/lib/bindings/http/receiver_structured.js
@@ -1,7 +1,7 @@
 const ReceiverV1 = require("./v1/receiver_structured_1.js");
 const ReceiverV3 = require("./v03/receiver_structured_0_3.js");
 
-const { SPEC_V03, SPEC_V1 } = require("./constants.js");
+const { SPEC_V03, SPEC_V1 } = require("./constants");
 const { check, parse } = require("./validation/structured.js");
 
 /** @typedef {import("../../cloudevent")} CloudEvent */
diff --git a/src/lib/bindings/http/v03/emitter_binary_0_3.js b/src/lib/bindings/http/v03/emitter_binary_0_3.js
index 204fd5e7..5ae9b604 100644
--- a/src/lib/bindings/http/v03/emitter_binary_0_3.js
+++ b/src/lib/bindings/http/v03/emitter_binary_0_3.js
@@ -10,7 +10,7 @@ const {
    TIME,
    SCHEMA_URL
   }
-} = require("../constants.js");
+} = require("../constants");
 
 function parser(header, parser = (v) => v) {
   return { headerName: header, parse: parser };
diff --git a/src/lib/bindings/http/v03/receiver_binary_0_3.js b/src/lib/bindings/http/v03/receiver_binary_0_3.js
index cdc0898d..7b3227ec 100644
--- a/src/lib/bindings/http/v03/receiver_binary_0_3.js
+++ b/src/lib/bindings/http/v03/receiver_binary_0_3.js
@@ -5,7 +5,7 @@ const {
   ENCODING_BASE64,
   HEADER_CONTENT_TYPE,
   BINARY_HEADERS_03
-} = require("../constants.js");
+} = require("../constants");
 const Spec = require("./spec_0_3.js");
 
 const JSONParser = require("../../../formats/json/parser.js");
diff --git a/src/lib/bindings/http/v03/receiver_structured_0_3.js b/src/lib/bindings/http/v03/receiver_structured_0_3.js
index 3dbdac01..411e7471 100644
--- a/src/lib/bindings/http/v03/receiver_structured_0_3.js
+++ b/src/lib/bindings/http/v03/receiver_structured_0_3.js
@@ -13,7 +13,7 @@ const {
     SUBJECT,
     DATA
   }
-} = require("../constants.js");
+} = require("../constants");
 const Spec = require("./spec_0_3.js");
 const JSONParser = require("../../../formats/json/parser.js");
 
diff --git a/src/lib/bindings/http/v1/emitter_binary_1.js b/src/lib/bindings/http/v1/emitter_binary_1.js
index 60a71d1d..40b1c74b 100644
--- a/src/lib/bindings/http/v1/emitter_binary_1.js
+++ b/src/lib/bindings/http/v1/emitter_binary_1.js
@@ -9,7 +9,7 @@ const {
    TIME,
    DATA_SCHEMA
  }
-} = require("../constants.js");
+} = require("../constants");
 
 function parser(header, parser = (v) => v) {
   return { headerName: header, parse: parser };
diff --git a/src/lib/bindings/http/v1/receiver_structured_1.js b/src/lib/bindings/http/v1/receiver_structured_1.js
index 9a1ca5a3..02f80bb9 100644
--- a/src/lib/bindings/http/v1/receiver_structured_1.js
+++ b/src/lib/bindings/http/v1/receiver_structured_1.js
@@ -13,7 +13,7 @@ const {
     DATA_BASE64,
     MIME_JSON
   }
-} = require("../constants.js");
+} = require("../constants");
 
 const Spec = require("./spec_1.js");
 const JSONParser = require("../../../formats/json/parser.js");
diff --git a/src/lib/bindings/http/validation/binary.js b/src/lib/bindings/http/validation/binary.js
index 4db5ff48..8cd3f387 100644
--- a/src/lib/bindings/http/validation/binary.js
+++ b/src/lib/bindings/http/validation/binary.js
@@ -9,7 +9,7 @@ const {
   HEADER_CONTENT_TYPE,
   MIME_JSON,
   DEFAULT_SPEC_VERSION_HEADER
-} = require("../constants.js");
+} = require("../constants");
 
 const {
   isString,
diff --git a/src/lib/bindings/http/validation/commons.js b/src/lib/bindings/http/validation/commons.js
index df85397f..7f438ba0 100644
--- a/src/lib/bindings/http/validation/commons.js
+++ b/src/lib/bindings/http/validation/commons.js
@@ -1,5 +1,5 @@
 const ValidationError = require("./validation_error.js");
-const Constants = require("../constants.js");
+const Constants = require("../constants");
 const {
   isDefinedOrThrow,
   isStringOrObjectOrThrow
diff --git a/src/lib/bindings/http/validation/structured.js b/src/lib/bindings/http/validation/structured.js
index a7688028..547da33f 100644
--- a/src/lib/bindings/http/validation/structured.js
+++ b/src/lib/bindings/http/validation/structured.js
@@ -6,7 +6,7 @@ const {
 } = require("./commons.js");
 const {
   HEADER_CONTENT_TYPE
-} = require("../constants.js");
+} = require("../constants");
 
 function check(payload, headers, receiver) {
   validateArgs(payload, headers);
diff --git a/src/lib/cloudevent.ts b/src/lib/cloudevent.ts
index 1c891196..76bb94e4 100644
--- a/src/lib/cloudevent.ts
+++ b/src/lib/cloudevent.ts
@@ -6,7 +6,7 @@ import Spec03 from "./bindings/http/v03/spec_0_3.js";
 import Formatter from "./formats/json/formatter.js";
 import { isBinary } from "./bindings/http/validation/fun.js";
 
-const { SPEC_V1, SPEC_V03 } = require("./bindings/http/constants.js");
+const { SPEC_V1, SPEC_V03 } = require("./bindings/http/constants");
 
 export type CE = CloudEventV1 | CloudEventV1Attributes | CloudEventV03 | CloudEventV03Attributes