feat(build): add ignoreConditions option to BuildOptions

src/build.ts

@@ -126,6 +126,7 @@ async function _build(
       dependencies: [],
       devDependencies: [],
       peerDependencies: [],
+      ignoreConditions: [],
       alias: {},
       replace: {},
       failOnWarn: true,

src/types.ts

@@ -143,6 +143,12 @@ export interface BuildOptions {
    * Run different types of builds (untyped, mkdist, Rollup, copy) simultaneously.
    */
   parallel: boolean;
+
+  /**
+   * Ignore conditions.
+   * If the condition is met, the build will be ignored.
+   */
+  ignoreConditions: string[];
 }
 
 export interface BuildContext {

src/validate.ts

@@ -55,6 +55,22 @@ export function validatePackage(
     return;
   }
 
+  for (const item of ctx.options.ignoreConditions || []) {
+    if (typeof pkg.exports === "object" && !Array.isArray(pkg.exports)) {
+      for (const key of Object.keys(pkg.exports)) {
+        const exportEntry = pkg.exports[key];
+        if (
+          exportEntry &&
+          typeof exportEntry === "object" &&
+          !Array.isArray(exportEntry) &&
+          exportEntry[item] !== undefined
+        ) {
+          delete exportEntry[item];
+        }
+      }
+    }
+  }
+
   const filenames = new Set(
     [
       ...(typeof pkg.bin === "string"