chore: Implement strict mode (denoland/deno_std#453)

Original: https://github.com/denoland/deno_std/commit/be24677d15494e83eea2e99bfc5ccfdde31cb892

2 files changed, 4 insertions, 3 deletions

diff --git a/textproto/mod.ts b/textproto/mod.ts
index 66f303905..6c4e42e51 100644
--- a/textproto/mod.ts
+++ b/textproto/mod.ts
@@ -82,7 +82,7 @@ export class TextProtoReader {
       throw new UnexpectedEOFError();
     } else if (buf[0] == charCode(" ") || buf[0] == charCode("\t")) {
       throw new ProtocolError(
-        `malformed MIME header initial line: ${str(line)}`
+        `malformed MIME header initial line: ${str(line!)}`
       );
     }
 
@@ -140,7 +140,7 @@ export class TextProtoReader {
       const { line: l, more } = r;
 
       // Avoid the copy if the first call produced a full line.
-      if (!line && !more) {
+      if (!line! && !more) {
         // TODO(ry):
         // This skipSpace() is definitely misplaced, but I don't know where it
         // comes from nor how to fix it.
@@ -150,6 +150,7 @@ export class TextProtoReader {
         return l;
       }
 
+      // @ts-ignore
       line = append(line, l);
       if (!more) {
         break;
diff --git a/textproto/reader_test.ts b/textproto/reader_test.ts
index bd0d39fd3..dfe918282 100644
--- a/textproto/reader_test.ts
+++ b/textproto/reader_test.ts
@@ -83,7 +83,7 @@ test({
 test({
   name: "[textproto] Reader : Large MIME Header",
   async fn(): Promise<void> {
-    const data = [];
+    const data: string[] = [];
     // Go test is 16*1024. But seems it can't handle more
     for (let i = 0; i < 1024; i++) {
       data.push("x");