diff --git a/dist/index.js b/dist/index.js
index 6dfec76..caa11d8 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -40,20 +40,18 @@ let flat = Array.prototype.flat ? list => list.flat() : list => [].concat(...lis
 async function getImports(entries) {
     let commentRE = /\/\*[\s\S]*?\*\/|\/\/\s*@import[^;]+;/g;
     let importRE = /(?<=@import\s[^"']*["']).+?(?=['"]\s*;)/g;
-    let promises = entries.map(entry =>
-        readFile(entry)
-            .then(data => {
-                data = data.replace(commentRE, "");
-                let dir = path.dirname(entry);
-                return (data.match(importRE) || []).map(importPath => {
-                    importPath = path.join(dir, importPath);
-                    if (!path.extname(importPath)) {
-                        importPath += ".less";
-                    }
-                    return importPath;
-                });
-            })
-    );
+    let promises = entries.map(async entry => {
+        let data = await readFile(entry);
+        data = data.replace(commentRE, "");
+        let dir = path.dirname(entry);
+        return (data.match(importRE) || []).map(importPath => {
+            importPath = path.join(dir, importPath);
+            if (!path.extname(importPath)) {
+                importPath += ".less";
+            }
+            return importPath;
+        });
+    });
     let importLists = await Promise.all(promises);
     return new Set(flat(importLists));
 }
@@ -61,21 +59,19 @@ async function getImports(entries) {
 function compile(entries, lessOptions) {
     let less = require("less");
     let inlineMap = lessOptions.sourceMap && lessOptions.sourceMap.sourceMapFileInline;
-    let promises = entries.map(entry =>
-        readFile(entry)
-            .then(data => less.render(data, {
-                ...lessOptions,
-                filename: entry
-            }))
-            .then(({css, map}) => {
-                let writeCSS = writeFile(setExt(entry, ".css"), css);
-                if (!map || inlineMap) {
-                    return writeCSS;
-                }
-                let writeMap = writeFile(setExt(entry, ".css.map"), map);
-                return Promise.all([writeCSS, writeMap]);
-            })
-    );
+    let promises = entries.map(async entry => {
+        let data = await readFile(entry);
+        let {css, map} = await less.render(data, {
+            ...lessOptions,
+            filename: entry
+        });
+        let writeCSS = writeFile(setExt(entry, ".css"), css);
+        if (!map || inlineMap) {
+            return writeCSS;
+        }
+        let writeMap = writeFile(setExt(entry, ".css.map"), map);
+        return Promise.all([writeCSS, writeMap]);
+    });
     return Promise.all(promises);
 }
 
diff --git a/package-lock.json b/package-lock.json
index ea1012b..fb73527 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,13 +1,13 @@
 {
   "name": "less-compile-roots",
-  "version": "0.2.3",
+  "version": "0.2.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
-      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
       "dev": true,
       "requires": {
         "@babel/highlight": "^7.0.0"
@@ -54,15 +54,15 @@
       "dev": true
     },
     "@types/node": {
-      "version": "12.6.2",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.6.2.tgz",
-      "integrity": "sha512-gojym4tX0FWeV2gsW4Xmzo5wxGjXGm550oVUII7f7G5o4BV6c7DBdiG1RRQd+y1bvqRyYtPfMK85UM95vsapqQ==",
+      "version": "12.6.9",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.6.9.tgz",
+      "integrity": "sha512-+YB9FtyxXGyD54p8rXwWaN1EWEyar5L58GlGWgtH2I9rGmLGBQcw63+0jw+ujqVavNuO47S1ByAjm9zdHMnskw==",
       "dev": true
     },
     "acorn": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
-      "integrity": "sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==",
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.1.tgz",
+      "integrity": "sha512-JD0xT5FCRDNyjDda3Lrg/IxFscp9q4tiYtxE1/nOzlKCk7hIRuYjhq1kCNkbPjMRMZuFq20HNQn1I9k8Oj0E+Q==",
       "dev": true
     },
     "acorn-jsx": {
@@ -72,9 +72,9 @@
       "dev": true
     },
     "ajv": {
-      "version": "6.10.1",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.1.tgz",
-      "integrity": "sha512-w1YQaVGNC6t2UCPjEawK/vo/dG8OOrVtUmhBT1uJJYxbl5kU2Tj3v6LGqBcsysN1yhuCStJCCA3GqdvKY8sqXQ==",
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
       "dev": true,
       "requires": {
         "fast-deep-equal": "^2.0.1",
@@ -213,6 +213,14 @@
         "semver": "^5.5.0",
         "shebang-command": "^1.2.0",
         "which": "^1.2.9"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+          "dev": true
+        }
       }
     },
     "debug": {
@@ -252,9 +260,9 @@
       "dev": true
     },
     "eslint": {
-      "version": "6.0.1",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.0.1.tgz",
-      "integrity": "sha512-DyQRaMmORQ+JsWShYsSg4OPTjY56u1nCjAmICrE8vLWqyLKxhFXOthwMj1SA8xwfrv0CofLNVnqbfyhwCkaO0w==",
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.1.0.tgz",
+      "integrity": "sha512-QhrbdRD7ofuV09IuE2ySWBz0FyXCq0rriLTZXZqaWSI79CVtHVRdkFuFTViiqzZhkCgfOh9USpriuGN2gIpZDQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
@@ -263,7 +271,7 @@
         "cross-spawn": "^6.0.5",
         "debug": "^4.0.1",
         "doctrine": "^3.0.0",
-        "eslint-scope": "^4.0.3",
+        "eslint-scope": "^5.0.0",
         "eslint-utils": "^1.3.1",
         "eslint-visitor-keys": "^1.0.0",
         "espree": "^6.0.0",
@@ -271,57 +279,35 @@
         "esutils": "^2.0.2",
         "file-entry-cache": "^5.0.1",
         "functional-red-black-tree": "^1.0.1",
-        "glob-parent": "^3.1.0",
+        "glob-parent": "^5.0.0",
         "globals": "^11.7.0",
         "ignore": "^4.0.6",
         "import-fresh": "^3.0.0",
         "imurmurhash": "^0.1.4",
-        "inquirer": "^6.2.2",
+        "inquirer": "^6.4.1",
         "is-glob": "^4.0.0",
         "js-yaml": "^3.13.1",
         "json-stable-stringify-without-jsonify": "^1.0.1",
         "levn": "^0.3.0",
-        "lodash": "^4.17.11",
+        "lodash": "^4.17.14",
         "minimatch": "^3.0.4",
         "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
         "optionator": "^0.8.2",
         "progress": "^2.0.0",
         "regexpp": "^2.0.1",
-        "semver": "^5.5.1",
-        "strip-ansi": "^4.0.0",
-        "strip-json-comments": "^2.0.1",
+        "semver": "^6.1.2",
+        "strip-ansi": "^5.2.0",
+        "strip-json-comments": "^3.0.1",
         "table": "^5.2.3",
-        "text-table": "^0.2.0"
-      },
-      "dependencies": {
-        "glob-parent": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
-          "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
-          "dev": true,
-          "requires": {
-            "is-glob": "^3.1.0",
-            "path-dirname": "^1.0.0"
-          },
-          "dependencies": {
-            "is-glob": {
-              "version": "3.1.0",
-              "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz",
-              "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
-              "dev": true,
-              "requires": {
-                "is-extglob": "^2.1.0"
-              }
-            }
-          }
-        }
+        "text-table": "^0.2.0",
+        "v8-compile-cache": "^2.0.3"
       }
     },
     "eslint-scope": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
-      "integrity": "sha512-p7VutNr1O/QrxysMo3E45FjYDTeXBy0iTltPFNSqKAIfjDSXC+4dj+qfyuD8bfAXrW/y6lW3O76VaYNPKfpKrg==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.0.0.tgz",
+      "integrity": "sha512-oYrhJW7S0bxAFDvWqzvMPRm6pcgcnWc4QnofCAqRTRfQC0JcwenzGglTtsLyIuuWFfkqDG9vz67cnttSd53djw==",
       "dev": true,
       "requires": {
         "esrecurse": "^4.1.0",
@@ -329,10 +315,13 @@
       }
     },
     "eslint-utils": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.3.1.tgz",
-      "integrity": "sha512-Z7YjnIldX+2XMcjr7ZkgEsOj/bREONV60qYeB/bjMAqqqZ4zxKyWX+BOUkdmRmA9riiIPVvo5x86m5elviOk0Q==",
-      "dev": true
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-1.4.0.tgz",
+      "integrity": "sha512-7ehnzPaP5IIEh1r1tkjuIrxqhNkzUJa9z3R92tLJdZIVdWaczEhr3EbhGtsMrVxi1KeR8qA7Off6SWc5WNQqyQ==",
+      "dev": true,
+      "requires": {
+        "eslint-visitor-keys": "^1.0.0"
+      }
     },
     "eslint-visitor-keys": {
       "version": "1.0.0",
@@ -382,9 +371,9 @@
       "dev": true
     },
     "esutils": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
-      "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=",
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.3.tgz",
+      "integrity": "sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==",
       "dev": true
     },
     "external-editor": {
@@ -592,23 +581,6 @@
         "string-width": "^2.1.0",
         "strip-ansi": "^5.1.0",
         "through": "^2.3.6"
-      },
-      "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
-        }
       }
     },
     "is-extglob": {
@@ -686,15 +658,15 @@
       }
     },
     "lodash": {
-      "version": "4.17.14",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
-      "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw==",
+      "version": "4.17.15",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
       "dev": true
     },
     "merge2": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.2.3.tgz",
-      "integrity": "sha512-gdUU1Fwj5ep4kplwcmftruWofEFt6lfpkkr3h860CXbAB9c3hGb55EOL2ali0Td5oebvW0E1+3Sr+Ur7XfKpRA=="
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.2.4.tgz",
+      "integrity": "sha512-FYE8xI+6pjFOhokZu0We3S5NKCirLbCzSh2Usf3qEyr4X8U+0jNg9P8RZ4qz+V2UoECLVwSyzU3LxXBaLGtD3A=="
     },
     "micromatch": {
       "version": "4.0.2",
@@ -806,12 +778,6 @@
         "callsites": "^3.0.0"
       }
     },
-    "path-dirname": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/path-dirname/-/path-dirname-1.0.2.tgz",
-      "integrity": "sha1-zDPSTVJeCZpTiMAzbG4yuRYGCeA=",
-      "dev": true
-    },
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -884,14 +850,14 @@
       }
     },
     "rollup": {
-      "version": "1.16.7",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.16.7.tgz",
-      "integrity": "sha512-P3GVcbVSLLjHWFLKGerYRe3Q/yggRXmTZFx/4WZf4wzGwO6hAg5jyMAFMQKc0dts8rFID4BQngfoz6yQbI7iMQ==",
+      "version": "1.18.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.18.0.tgz",
+      "integrity": "sha512-MBAWr6ectF948gW/bs/yfi0jW7DzwI8n0tEYG/ZMQutmK+blF/Oazyhg3oPqtScCGV8bzCtL9KzlzPtTriEOJA==",
       "dev": true,
       "requires": {
         "@types/estree": "0.0.39",
-        "@types/node": "^12.0.10",
-        "acorn": "^6.1.1"
+        "@types/node": "^12.6.3",
+        "acorn": "^6.2.0"
       }
     },
     "run-async": {
@@ -924,9 +890,9 @@
       "dev": true
     },
     "semver": {
-      "version": "5.7.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
-      "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+      "version": "6.3.0",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
       "dev": true
     },
     "shebang-command": {
@@ -975,21 +941,40 @@
       "requires": {
         "is-fullwidth-code-point": "^2.0.0",
         "strip-ansi": "^4.0.0"
+      },
+      "dependencies": {
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
       }
     },
     "strip-ansi": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
-      "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
       "dev": true,
       "requires": {
-        "ansi-regex": "^3.0.0"
+        "ansi-regex": "^4.1.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        }
       }
     },
     "strip-json-comments": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
-      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
+      "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
       "dev": true
     },
     "supports-color": {
@@ -1002,23 +987,17 @@
       }
     },
     "table": {
-      "version": "5.4.1",
-      "resolved": "https://registry.npmjs.org/table/-/table-5.4.1.tgz",
-      "integrity": "sha512-E6CK1/pZe2N75rGZQotFOdmzWQ1AILtgYbMAbAjvms0S1l5IDB47zG3nCnFGB/w+7nB3vKofbLXCH7HPBo864w==",
+      "version": "5.4.5",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.5.tgz",
+      "integrity": "sha512-oGa2Hl7CQjfoaogtrOHEJroOcYILTx7BZWLGsJIlzoWmB2zmguhNfPJZsWPKYek/MgCxfco54gEi31d1uN2hFA==",
       "dev": true,
       "requires": {
-        "ajv": "^6.9.1",
-        "lodash": "^4.17.11",
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
         "slice-ansi": "^2.1.0",
         "string-width": "^3.0.0"
       },
       "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -1029,15 +1008,6 @@
             "is-fullwidth-code-point": "^2.0.0",
             "strip-ansi": "^5.1.0"
           }
-        },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
         }
       }
     },
@@ -1094,6 +1064,12 @@
         "punycode": "^2.1.0"
       }
     },
+    "v8-compile-cache": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.0.3.tgz",
+      "integrity": "sha512-CNmdbwQMBjwr9Gsmohvm0pbL954tJrNzf6gWL3K+QMQf00PF7ERGrEiLgjuU3mKreLC2MeGhUsNV9ybTbLgd3w==",
+      "dev": true
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
diff --git a/package.json b/package.json
index c86b382..a2f8db9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "less-compile-roots",
-  "version": "0.2.3",
+  "version": "0.2.4",
   "description": "Tool for extracting and compiling root Less files",
   "main": "dist/index.js",
   "module": "src/index.mjs",
@@ -29,8 +29,8 @@
     "fast-glob": "^3.0.4"
   },
   "devDependencies": {
-    "eslint": "^6.0.1",
-    "rollup": "^1.16.7"
+    "eslint": "^6.1.0",
+    "rollup": "^1.18.0"
   },
   "peerDependencies": {
     "less": ">=2.0.0"
diff --git a/src/index.mjs b/src/index.mjs
index 3957e82..1274444 100644
--- a/src/index.mjs
+++ b/src/index.mjs
@@ -8,20 +8,18 @@ let flat = Array.prototype.flat ? list => list.flat() : list => [].concat(...lis
 async function getImports(entries) {
     let commentRE = /\/\*[\s\S]*?\*\/|\/\/\s*@import[^;]+;/g;
     let importRE = /(?<=@import\s[^"']*["']).+?(?=['"]\s*;)/g;
-    let promises = entries.map(entry =>
-        readFile(entry)
-            .then(data => {
-                data = data.replace(commentRE, "");
-                let dir = path.dirname(entry);
-                return (data.match(importRE) || []).map(importPath => {
-                    importPath = path.join(dir, importPath);
-                    if (!path.extname(importPath)) {
-                        importPath += ".less";
-                    }
-                    return importPath;
-                });
-            })
-    );
+    let promises = entries.map(async entry => {
+        let data = await readFile(entry);
+        data = data.replace(commentRE, "");
+        let dir = path.dirname(entry);
+        return (data.match(importRE) || []).map(importPath => {
+            importPath = path.join(dir, importPath);
+            if (!path.extname(importPath)) {
+                importPath += ".less";
+            }
+            return importPath;
+        });
+    });
     let importLists = await Promise.all(promises);
     return new Set(flat(importLists));
 }
@@ -29,21 +27,19 @@ async function getImports(entries) {
 function compile(entries, lessOptions) {
     let less = require("less");
     let inlineMap = lessOptions.sourceMap && lessOptions.sourceMap.sourceMapFileInline;
-    let promises = entries.map(entry =>
-        readFile(entry)
-            .then(data => less.render(data, {
-                ...lessOptions,
-                filename: entry
-            }))
-            .then(({css, map}) => {
-                let writeCSS = writeFile(setExt(entry, ".css"), css);
-                if (!map || inlineMap) {
-                    return writeCSS;
-                }
-                let writeMap = writeFile(setExt(entry, ".css.map"), map);
-                return Promise.all([writeCSS, writeMap]);
-            })
-    );
+    let promises = entries.map(async entry => {
+        let data = await readFile(entry);
+        let {css, map} = await less.render(data, {
+            ...lessOptions,
+            filename: entry
+        });
+        let writeCSS = writeFile(setExt(entry, ".css"), css);
+        if (!map || inlineMap) {
+            return writeCSS;
+        }
+        let writeMap = writeFile(setExt(entry, ".css.map"), map);
+        return Promise.all([writeCSS, writeMap]);
+    });
     return Promise.all(promises);
 }
 
diff --git a/test/package-lock.json b/test/package-lock.json
index 1c85e6d..b5ac412 100644
--- a/test/package-lock.json
+++ b/test/package-lock.json
@@ -48,14 +48,14 @@
       "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA=="
     },
     "@types/node": {
-      "version": "12.0.10",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.0.10.tgz",
-      "integrity": "sha512-LcsGbPomWsad6wmMNv7nBLw7YYYyfdYcz6xryKYQhx89c3XXan+8Q6AJ43G5XDIaklaVkK3mE4fCb0SBvMiPSQ=="
+      "version": "12.6.9",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.6.9.tgz",
+      "integrity": "sha512-+YB9FtyxXGyD54p8rXwWaN1EWEyar5L58GlGWgtH2I9rGmLGBQcw63+0jw+ujqVavNuO47S1ByAjm9zdHMnskw=="
     },
     "ajv": {
-      "version": "6.10.0",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.0.tgz",
-      "integrity": "sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==",
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
       "optional": true,
       "requires": {
         "fast-deep-equal": "^2.0.1",
@@ -316,9 +316,9 @@
       "optional": true
     },
     "fast-glob": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.0.3.tgz",
-      "integrity": "sha512-scDJbDhN+6S4ELXzzN96Fqm5y1CMRn+Io3C4Go+n/gUKP+LW26Wma6IxLSsX2eAMBUOFmyHKDBrUSuoHsycQ5A==",
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.0.4.tgz",
+      "integrity": "sha512-wkIbV6qg37xTJwqSsdnIphL1e+LaGz4AIQqr00mIubMaEhv1/HEmJ0uuCGZRNRUkZZmOB5mJKO0ZUTVq+SxMQg==",
       "requires": {
         "@nodelib/fs.stat": "^2.0.1",
         "@nodelib/fs.walk": "^1.2.1",
@@ -430,9 +430,9 @@
       }
     },
     "graceful-fs": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.0.tgz",
-      "integrity": "sha512-jpSvDPV4Cq/bgtpndIWbI5hmYxhQGHPC4d4cqBPb4DLniCfhJokdXhwhaDuLBGLQdvvRum/UiX6ECVIPvDXqdg=="
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.1.tgz",
+      "integrity": "sha512-b9usnbDGnD928gJB3LrCmxoibr3VE4U2SMo5PBuBnokWyDADTqDPXg4YpwKF1trpH+UbGp7QLicO3+aWEy0+mw=="
     },
     "har-schema": {
       "version": "2.0.0",
@@ -515,9 +515,9 @@
       "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng=="
     },
     "is-path-cwd": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-2.1.0.tgz",
-      "integrity": "sha512-Sc5j3/YnM8tDeyCsVeKlm/0p95075DyLmDEIkSgQ7mXkrOX+uTCtmQFm0CYzVyJwcCCmO3k8qfJt17SxQwB5Zw=="
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-2.2.0.tgz",
+      "integrity": "sha512-w942bTcih8fdJPJmQHFzkS76NEP8Kzzvmw92cXsazb8intwLqPibPPdXf4ANdKV3rYMuuQYGIWtvz9JilB3NFQ=="
     },
     "is-path-in-cwd": {
       "version": "2.1.0",
@@ -610,10 +610,10 @@
       }
     },
     "less-compile-roots": {
-      "version": "file:../less-compile-roots-0.2.3.tgz",
-      "integrity": "sha512-IxZMOKw4UFW6ykmtuNET7O9j95N7tuY+gCVaQ86q36hypta88CAD2+/YX7xqsSX53PK36wzH/ZPEEpiaUl8TWg==",
+      "version": "file:../less-compile-roots-0.2.4.tgz",
+      "integrity": "sha512-ipIOw3rA/tMGT/Ji3p2a18fuvlnMdwMCp2zJMoc8sOZsRG/KL80JUVX4GuhceTfe/Fms/YkEZX9abQv8x3xx2g==",
       "requires": {
-        "fast-glob": "^3.0.3"
+        "fast-glob": "^3.0.4"
       }
     },
     "load-json-file": {
@@ -674,9 +674,9 @@
       }
     },
     "merge2": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.2.3.tgz",
-      "integrity": "sha512-gdUU1Fwj5ep4kplwcmftruWofEFt6lfpkkr3h860CXbAB9c3hGb55EOL2ali0Td5oebvW0E1+3Sr+Ur7XfKpRA=="
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.2.4.tgz",
+      "integrity": "sha512-FYE8xI+6pjFOhokZu0We3S5NKCirLbCzSh2Usf3qEyr4X8U+0jNg9P8RZ4qz+V2UoECLVwSyzU3LxXBaLGtD3A=="
     },
     "micromatch": {
       "version": "4.0.2",
@@ -885,9 +885,9 @@
       "optional": true
     },
     "psl": {
-      "version": "1.1.33",
-      "resolved": "https://registry.npmjs.org/psl/-/psl-1.1.33.tgz",
-      "integrity": "sha512-LTDP2uSrsc7XCb5lO7A8BI1qYxRe/8EqlRvMeEl6rsnYAqDOl8xHR+8lSAIVfrNaSAlTPTNOCgNjWcoUL3AZsw==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/psl/-/psl-1.3.0.tgz",
+      "integrity": "sha512-avHdspHO+9rQTLbv1RO+MPYeP/SzsCoxofjVnHanETfQhTJrmB0HlDoW+EiN/R+C0BZ+gERab9NY0lPN2TxNag==",
       "optional": true
     },
     "punycode": {
@@ -964,9 +964,9 @@
       }
     },
     "resolve": {
-      "version": "1.11.1",
-      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.11.1.tgz",
-      "integrity": "sha512-vIpgF6wfuJOZI7KKKSP+HmiKggadPQAdsp5HiC1mvqnfp0gF1vdwgBWZIdrVft9pgqoMFQN+R7BSWZiBxx+BBw==",
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.12.0.tgz",
+      "integrity": "sha512-B/dOmuoAik5bKcD6s6nXDCjzUKnaDvdkRyAk6rsmsKLipWj4797iothd7jmmUhWTfinVMU+wc56rYKsit2Qy4w==",
       "requires": {
         "path-parse": "^1.0.6"
       }
@@ -990,9 +990,9 @@
       "integrity": "sha512-DEqnSRTDw/Tc3FXf49zedI638Z9onwUotBMiUFKmrO2sdFKIbXamXGQ3Axd4qgphxKB4kw/qP1w5kTxnfU1B9Q=="
     },
     "safe-buffer": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+      "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
       "optional": true
     },
     "safer-buffer": {
@@ -1041,9 +1041,9 @@
       }
     },
     "spdx-license-ids": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.4.tgz",
-      "integrity": "sha512-7j8LYJLeY/Yb6ACbQ7F76qy5jHkp0U6jgBfJsk97bwWlVUnUWsAgpyaCvo17h0/RQGnQ036tVDomiwoI4pDkQA=="
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
+      "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q=="
     },
     "sshpk": {
       "version": "1.16.1",
diff --git a/test/package.json b/test/package.json
index e04831c..b620845 100644
--- a/test/package.json
+++ b/test/package.json
@@ -12,6 +12,6 @@
   "dependencies": {
     "del-cli": "^2.0.0",
     "less": "^3.9.0",
-    "less-compile-roots": "file:../less-compile-roots-0.2.3.tgz"
+    "less-compile-roots": "file:../less-compile-roots-0.2.4.tgz"
   }
 }