Use project relative preference for declaration emit (#42232)

* Test where relative import isnt ideal in the declaration emit

* use project relative preference for declaration emit
Fixes #39117

* Fix incorrect path matching when calculating module specifier

* Use correct baseUrl for the module specifier

tests/cases/compiler/declarationEmitPathMappingMonorepo2.ts

@@ -0,0 +1,44 @@
+// @filename: packages/core/src/index.d.ts
+export * from "./utils";
+export { default as SvgIcon } from "./SvgIcon";
+
+// @filename: packages/core/src/SvgIcon.d.ts
+import { StyledComponentProps } from "@ts-bug/styles";
+export interface SvgIconProps extends StyledComponentProps<"root"> {
+    children?: string[];
+}
+export interface SomeInterface {
+    myProp: string;
+}
+declare const SvgIcon: SomeInterface;
+export default SvgIcon;
+
+// @filename: packages/core/src/utils.d.ts
+import SvgIcon from "./SvgIcon";
+export function createSvgIcon(path: string, displayName: string): typeof SvgIcon;
+
+// @filename: packages/styles/src/index.d.ts
+export interface StyledComponentProps<ClassKey extends string> {
+    classes?: Record<ClassKey, string>;
+}
+
+// @filename: packages/lab/src/index.ts
+import { createSvgIcon } from "@ts-bug/core/utils";
+export default createSvgIcon("Hello", "ArrowLeft");
+
+// @filename: packages/lab/tsconfig.json
+{
+    "compilerOptions": {
+        "outDir": "dist",
+        "declaration": true,
+        "baseUrl": "../",
+        "paths": {
+            "@ts-bug/core": ["./core/src"],
+            "@ts-bug/core/*": ["./core/src/*"],
+            "@ts-bug/lab": ["./lab/src"],
+            "@ts-bug/lab/*": ["./lab/src/*"],
+            "@ts-bug/styles": ["./styles/src"],
+            "@ts-bug/styles/*": ["./styles/src/*"]
+        }
+    }
+}