chore: generate sdk into packages/sdk

1 files changed, 97 insertions, 0 deletions

diff --git a/packages/sdk/src/internal/headers.ts b/packages/sdk/src/internal/headers.ts
new file mode 100644
index 000000000..c724a9d22
--- /dev/null
+++ b/packages/sdk/src/internal/headers.ts
@@ -0,0 +1,97 @@
+// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+import { isReadonlyArray } from './utils/values';
+
+type HeaderValue = string | undefined | null;
+export type HeadersLike =
+  | Headers
+  | readonly HeaderValue[][]
+  | Record<string, HeaderValue | readonly HeaderValue[]>
+  | undefined
+  | null
+  | NullableHeaders;
+
+const brand_privateNullableHeaders = /* @__PURE__ */ Symbol('brand.privateNullableHeaders');
+
+/**
+ * @internal
+ * Users can pass explicit nulls to unset default headers. When we parse them
+ * into a standard headers type we need to preserve that information.
+ */
+export type NullableHeaders = {
+  /** Brand check, prevent users from creating a NullableHeaders. */
+  [brand_privateNullableHeaders]: true;
+  /** Parsed headers. */
+  values: Headers;
+  /** Set of lowercase header names explicitly set to null. */
+  nulls: Set<string>;
+};
+
+function* iterateHeaders(headers: HeadersLike): IterableIterator<readonly [string, string | null]> {
+  if (!headers) return;
+
+  if (brand_privateNullableHeaders in headers) {
+    const { values, nulls } = headers;
+    yield* values.entries();
+    for (const name of nulls) {
+      yield [name, null];
+    }
+    return;
+  }
+
+  let shouldClear = false;
+  let iter: Iterable<readonly (HeaderValue | readonly HeaderValue[])[]>;
+  if (headers instanceof Headers) {
+    iter = headers.entries();
+  } else if (isReadonlyArray(headers)) {
+    iter = headers;
+  } else {
+    shouldClear = true;
+    iter = Object.entries(headers ?? {});
+  }
+  for (let row of iter) {
+    const name = row[0];
+    if (typeof name !== 'string') throw new TypeError('expected header name to be a string');
+    const values = isReadonlyArray(row[1]) ? row[1] : [row[1]];
+    let didClear = false;
+    for (const value of values) {
+      if (value === undefined) continue;
+
+      // Objects keys always overwrite older headers, they never append.
+      // Yield a null to clear the header before adding the new values.
+      if (shouldClear && !didClear) {
+        didClear = true;
+        yield [name, null];
+      }
+      yield [name, value];
+    }
+  }
+}
+
+export const buildHeaders = (newHeaders: HeadersLike[]): NullableHeaders => {
+  const targetHeaders = new Headers();
+  const nullHeaders = new Set<string>();
+  for (const headers of newHeaders) {
+    const seenHeaders = new Set<string>();
+    for (const [name, value] of iterateHeaders(headers)) {
+      const lowerName = name.toLowerCase();
+      if (!seenHeaders.has(lowerName)) {
+        targetHeaders.delete(name);
+        seenHeaders.add(lowerName);
+      }
+      if (value === null) {
+        targetHeaders.delete(name);
+        nullHeaders.add(lowerName);
+      } else {
+        targetHeaders.append(name, value);
+        nullHeaders.delete(lowerName);
+      }
+    }
+  }
+  return { [brand_privateNullableHeaders]: true, values: targetHeaders, nulls: nullHeaders };
+};
+
+export const isEmptyHeaders = (headers: HeadersLike) => {
+  for (const _ of iterateHeaders(headers)) return false;
+  return true;
+};