diff --git a/package-lock.json b/package-lock.json
index 86f8e549..6a03135b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,25 +1,25 @@
 {
   "name": "pprof",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "lockfileVersion": 1,
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-      "integrity": "sha1-BuKrGb21NThVWaq7W6WXKUgoAPg=",
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       "dev": true,
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       }
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-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
-      "integrity": "sha1-wjDnlYmuenKf1GMbne1NwiBBgZY=",
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.5.0.tgz",
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       "dev": true,
       "requires": {
-        "@babel/types": "^7.4.0",
+        "@babel/types": "^7.5.0",
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         "lodash": "^4.17.11",
         "source-map": "^0.5.0",
@@ -37,7 +37,7 @@
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-      "integrity": "sha1-oM6wFoX3M1XUNgwSR/WCv6/I/1M=",
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       "dev": true,
       "requires": {
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@@ -48,69 +48,61 @@
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-      "integrity": "sha1-g1ctQyDipGVyY3NBE8QoaLZOScM=",
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-      "integrity": "sha1-Vxv9UnAfSSkg1jt/c1Aw6aPhC1U=",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
+      "integrity": "sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.4.0"
+        "@babel/types": "^7.4.4"
       }
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-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
-      "integrity": "sha1-9xDDjI1Fjm3ZogGvtjf8t4HOmeQ=",
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
       "dev": true,
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-      },
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-          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
-          "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
-          "dev": true
-        }
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-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
-      "integrity": "sha1-6zrID2SqEByQfUzlQGNg/nW3iVs=",
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.5.0.tgz",
+      "integrity": "sha512-I5nW8AhGpOXGCCNYGc+p7ExQIBxRFnS2fd/d862bNOKvmoEPjYPcfIjsfdy0ujagYOIYPczKgD9l3FsgTkAzKA==",
       "dev": true
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-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.0.tgz",
-      "integrity": "sha1-EkdOnAd7rlhcXYNalcCwt5DCXIs=",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
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-        "@babel/parser": "^7.4.0",
-        "@babel/types": "^7.4.0"
+        "@babel/parser": "^7.4.4",
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-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.3.tgz",
-      "integrity": "sha1-GgHwePxXXVif8wwPcb88PZzLrYQ=",
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.5.0.tgz",
+      "integrity": "sha512-SnA9aLbyOCcnnbQEGwdfBggnc142h/rbqqsXcaATj2hZcegCl903pUD/lfpsNBlBSuWow/YDfRyJuWi2EPR5cg==",
       "dev": true,
       "requires": {
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-        "@babel/generator": "^7.4.0",
+        "@babel/generator": "^7.5.0",
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-        "@babel/helper-split-export-declaration": "^7.4.0",
-        "@babel/parser": "^7.4.3",
-        "@babel/types": "^7.4.0",
+        "@babel/helper-split-export-declaration": "^7.4.4",
+        "@babel/parser": "^7.5.0",
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         "globals": "^11.1.0",
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@@ -124,19 +116,13 @@
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-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
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-          "dev": true
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-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
-      "integrity": "sha1-Zwck930kzObMfYz2RZnVEdFkiUw=",
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.5.0.tgz",
+      "integrity": "sha512-UFpDVqRABKsW01bvw7/wSUe56uy6RXM5+VJibVVAybDGxEW25jdwiFJEf7ASvSaC7sN7rbE/l3cLp2izav+CtQ==",
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@@ -152,12 +138,12 @@
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-      "integrity": "sha1-TIVzDlm5ofHzSQR9vyQpYDS7JzU="
+      "integrity": "sha512-AZkcAA5vnN/v4PDqKyMR5lx7hZttPDgClv83E//FMNhR2TMcLUhfRUBHCmSl0oi9zMgDDqRUJkSxO3wm85+XLg=="
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-      "integrity": "sha1-fvN/DQEPsCitGtWXIuUG2SYoFcs="
+      "integrity": "sha512-YyFaikqM5sH0ziFZCN3xDC7zeGaB/d0IUb9CATugHWbd1FRFwWwt4ld4OYMPWu5a3Xe01mGAULCdqhMlPl29Jg=="
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@@ -207,7 +193,7 @@
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-      "integrity": "sha1-ez7C2Wr0gdegMhJS57HJRyTsWng=",
+      "integrity": "sha512-9jHK3YF/8HtJ9wCAbG+j8cD0i0+ATS9A7gXFqS36TblLPNy6rEEc+SB0imo91eCboGaBYGV/MT1/br/J+EE7Tw==",
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@@ -216,7 +202,7 @@
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-      "integrity": "sha1-UjEPL5vLxnvawYyUrUkBuV/eJn4=",
+      "integrity": "sha512-tsHvOB24rvyvV2+zKMmPkZ7dXX6LSLKZ7aOtXY6Edklp0uRcgGpOsQTTGTcWViFyx4uhWc6GV8QdnALbIbIdeQ==",
       "dev": true,
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@@ -224,9 +210,9 @@
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-      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.0.tgz",
-      "integrity": "sha512-beHeJM/RRAaLLsMJhsCvHK31rIqZuobfPLa/80yGH5hnD8PV1hyh9xJBJNFfNmO7yWqm+zomijHsXpI6iTQJfQ==",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.2.tgz",
+      "integrity": "sha512-ILO/rR8LfAb60Y1Yfp9vxfYAASK43NFC2mLzpvLUbCQY/Qu8YwReboseu8aheCEkyElZF2L2T9mHcR2bgdvZyA==",
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@@ -237,7 +223,7 @@
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-      "integrity": "sha1-jaXGUwkVZT86Hzj9XxAdjD+AecU=",
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       "dev": true
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@@ -252,13 +238,13 @@
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       "resolved": "https://registry.npmjs.org/@types/caseless/-/caseless-0.12.2.tgz",
-      "integrity": "sha1-9l09Y4ngHutFi9VNyPUrlalGO8g=",
+      "integrity": "sha512-6ckxMjBBD8URvjB6J3NcnuAn5Pkl7t3TizAg+xdlzzQGSPSmBcXf8KoIH0ua/i+tio+ZRUHEXp0HEmvaR4kt0w==",
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-      "integrity": "sha1-7is7jqoRwJOCiZU2BrdFtzjFSx4=",
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@@ -267,23 +253,23 @@
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-      "integrity": "sha1-uGItUFV90VXp8vY0t9aP043l6Us=",
+      "version": "5.2.7",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.7.tgz",
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-      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.1.tgz",
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+      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.12.tgz",
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-      "integrity": "sha1-lKYI6bJYpsYVahPRoU/XINunC5c=",
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@@ -292,19 +278,19 @@
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-      "integrity": "sha1-G8ddrEPjHbqYHDfgoI7d3BtJzTk=",
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@@ -314,27 +300,27 @@
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-      "integrity": "sha1-H5IfDDR7GfdU5h28ZxwIjfc/4f8=",
+      "version": "7.0.13",
+      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-7.0.13.tgz",
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@@ -346,9 +332,9 @@
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-      "integrity": "sha1-2J5ZmfeXh1Z0wH2H8mD8Qeg+jKk=",
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@@ -399,7 +385,7 @@
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-      "integrity": "sha1-V9NbhoboUeLMBMQD8cACA5dqGBM=",
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@@ -416,7 +402,7 @@
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@@ -425,7 +411,7 @@
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-      "integrity": "sha1-BGpSrlgqIovXL1is++KWfGeHWas=",
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@@ -434,7 +420,7 @@
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-      "integrity": "sha1-le+U+F7MgdAHwmThkKEg8KPIVms=",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
     "yallist": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
-      "integrity": "sha1-tLBJ4xS+VF486AIjbWzSLNkcPek="
+      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A=="
     },
     "yargs": {
       "version": "13.2.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
-      "integrity": "sha1-DBAfWArpXOp/Odkn53cOP9yX+ZM=",
+      "integrity": "sha512-WyEoxgyTD3w5XRpAQNYUB9ycVH/PQrToaTXdYXRdOXvEy1l19br+VJsc0vcO8PTGg5ro/l/GY7F/JMEBmI0BxA==",
       "dev": true,
       "requires": {
         "cliui": "^4.0.0",
@@ -4424,19 +4392,19 @@
         "ansi-regex": {
           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha1-i5+PCM8ay4Q3Vqg5yox+MWjFGZc=",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
           "dev": true
         },
         "camelcase": {
           "version": "5.3.1",
           "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
-          "integrity": "sha1-48mzFWnhBoEd8kL3FXJaH0xJQyA=",
+          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
           "dev": true
         },
         "find-up": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-          "integrity": "sha1-SRafHXmTQwZG2mHsxa41XCHJe3M=",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
           "dev": true,
           "requires": {
             "locate-path": "^3.0.0"
@@ -4451,7 +4419,7 @@
         "locate-path": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
-          "integrity": "sha1-2+w7OrdZdYBxtY/ln8QYca8hQA4=",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
           "dev": true,
           "requires": {
             "p-locate": "^3.0.0",
@@ -4461,7 +4429,7 @@
         "p-locate": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
-          "integrity": "sha1-Mi1poFwCZLJZl9n0DNiokasAZKQ=",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
           "dev": true,
           "requires": {
             "p-limit": "^2.0.0"
@@ -4470,7 +4438,7 @@
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha1-InZ74htirxCBV0MG9prFG2IgOWE=",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
           "dev": true,
           "requires": {
             "emoji-regex": "^7.0.1",
@@ -4481,16 +4449,16 @@
         "strip-ansi": {
           "version": "5.2.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha1-jJpTb+tq/JYr36WxBKUJHBrZwK4=",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
           "dev": true,
           "requires": {
             "ansi-regex": "^4.1.0"
           }
         },
         "yargs-parser": {
-          "version": "13.0.0",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
-          "integrity": "sha1-P8RPPnaovbHMNgLoYBCGAuXM3os=",
+          "version": "13.1.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+          "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
           "dev": true,
           "requires": {
             "camelcase": "^5.0.0",
@@ -4502,7 +4470,7 @@
     "yargs-parser": {
       "version": "10.1.0",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
-      "integrity": "sha1-cgImW4n36eny5XZeD+c1qQXtuqg=",
+      "integrity": "sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==",
       "dev": true,
       "requires": {
         "camelcase": "^4.1.0"
@@ -4511,7 +4479,7 @@
     "yargs-unparser": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
-      "integrity": "sha1-8rsqfoPLyHu5XI5XKCigbJrdbg0=",
+      "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
       "dev": true,
       "requires": {
         "flat": "^4.1.0",
diff --git a/ts/src/profile-serializer.ts b/ts/src/profile-serializer.ts
index 891a4ef2..2ca5bd75 100644
--- a/ts/src/profile-serializer.ts
+++ b/ts/src/profile-serializer.ts
@@ -156,9 +156,7 @@ function serialize<T extends ProfileNode>(
         profLoc = sourceMapper.mappingInfo(profLoc);
       }
     }
-    const keyStr = `${node.scriptId}:${profLoc.line}:${profLoc.column}:${
-      profLoc.name
-    }`;
+    const keyStr = `${node.scriptId}:${profLoc.line}:${profLoc.column}:${profLoc.name}`;
     let id = locationIdMap.get(keyStr);
     if (id !== undefined) {
       // id is index+1, since 0 is not valid id.